scissor-jack points for prime

Look for the crimp points behind the front tires and in front of the rear tires. The scissor-jack should've been under the rear seat access door. Open the rear drivers side door and look for the cutout below the rear seat cushion. You can shove some supplementary tire change equipment there too. Gloves, trash bags, wheel chuck, highway flares and plugs.

Hope this helps...

 

You have an early model Gen 4 Prius Prime with a TNGA chassis.

Early TNGA cars were provided with a flat top jack that is different than later models. It has a smooth top like the one in the photo posted by Priuschat member Hammersmith in this thread.

 

Re: that first picture - I'd move to the right more - towards the center of the car and jack at the sheet metal pinch point. Just like the rear. There's too much plastic in the area you've marked. The sheet metal pinch point is unmistakable and a solid area to jack. IMHO

 

What is the width of this rail marked in red?

 

Did you check under the rear seat storage compartment? All 2017-2022 Prius Prime came with standard OEM scissor-jack stored under the rear seat with a bag of tools.

 

Did you buy the car used? If it was purchased new, then OEM tools and jack are standard in all models of PP (2017-2022) AFAIK. Here is the diagram from the 21 PP manual, I think it is identical to the 2017 PP. I owned 2017, 2020, and 2021 PPs. I also copied the "jack point" diagram from the same manual. I never used the OEM scissor jack, but I used my own floor jack to lift the car from the side many times to change to winter wheels/tires.

 

That's where I found mine...... Check under your charging cable or the pockets opposite the tire pump and slime canister.
I relocated those tools, stuffed them next to the jack. Wrapped them in a kitchen towel, so they wouldn't rattle down the road. Makes for a good cleaning towel to tidy up afterwards.

Notice the pictures shows jacking at the sheet metal pinch points.

 

You don't need to stuff them next to the jack in that small opening. The rear seats are just clipped in place at the front. Just pull up the front of the seats and they'll come off. You have more room there than on the jack opening

 

You can read this thread to get the information you need: Operation Spare Tire | PriusChat
If you want a compact donut tire, then eBay would be the best place to find a used compact spare for Gen3 Prius (not Prius C or Prius V) or a very rare Gen4 Prius compact spare. Some say Corolla spare also works, but Corolla has several trims and different tire sizes, so you may find it incompatible. You can order a new compact spare wheel and tire from a dealer, but the cost would be quite high.

As I commented on that thread I linked, I used a full-size 15" generic steel wheel with a regular full-size 195-65r-15 tire as a spare. You will have to store the spare on the deck or behind the front seat anyway. There is no room to store under the deck for that is where the battery resides. A full-size spare on a 15" wheel will be heavier and thicker, but it will fit better in the footwell in front of the rear seat, and you are not restricted to the 50mph max speed or 50miles distance limit. Almost any 15" steel wheel with 5x100 bolt pattern would work for this purpose.
And it maybe cheaper than buying a compact spare.

Here is an example with 40mm offset: Vision Wheel SW60 16x6.5 5x100 40mm Black | SW60-6644B40
Similar one (maybe the same?) at Walmart: https://www.walmart.com/ip/Vision-Black-Snow-Wheel-16x6-5-5x100-40et-Black-Wheel/670876592

This is the spec on the full-size OEM wheel. 2017 Toyota Prius Prime - Wheel & Tire Sizes, PCD, Offset and Rims specs | Wheel-Size.com

 

I found it hard to find a replacement temp spare for our 2010; Kal Tire said flat out (excuse the pun) they don’t deal with temp spares, suggested dealership.

Owners manual has spec.

FWIW, third Gen specd temp spare will also work, and it’s OD is closer to stock 15” tire OD, shy maybe 1/8”.

 

Combined with above.

 

Unless you have a AWD, it doesn't really matter as the donut spare should always be put on a non traction wheel. So if you have a front tire flat, you replace the rear tire with the donut, replace the front flat tire with the rear tire you just remove. A bit more demanding to you, but far less demanding on the differential.

 

Cars for many years, going back in my family fleet to our 1996 Volvo, always use the reinforced pinch weld locations as noted above. There are rubber or metal pinch weld jack pads to make this easier to hold the right spot. Some bone headed mechanics will jack the pinch weld spots without the jack pads and bend the places over making the next jacking more difficult.