On models with no spare tire, what are folks doing?

If I grab a donut from 2010 to 2022, do I still the 3-piece Styrofoam?
I have one pig piece Styrofoam that came with the car - 2017 P4

 

Sorry can’t answer that. I do know the rims and tire sizes are the same, but nothing reslly about fitment requirements for under the hatch floor. There are some threads here on that though.

 

The 3-piece foam is needed because the center piece is hollowed out to fit the spare tire. Your existing piece of foam is a solid chunk. The center piece of foam is pretty tightly fitted around the factory Gen4 spare. I am not positive if the Gen3 will fit with it or not. The contours of a Gen3 tire/rim need to be very close/exact to a Gen4, otherwise the foam won’t drop down far enough when assembling everything, and the carpeted floor liner might sit crooked or too high.

 

Gen 3 spare tire OD is slightly more. You can get the two gens tire specs from owners manuals, enter them on a tire comparison calculator site, to determine the difference:

Tire Size Comparison

 

Ok - @Optimus used a 2017 Donor - the forms worked for him on his 2016 - all gen 4.
@Mendel Leisk says donut from 2010 fits but unsure if the foams will fit - so safest bet is to find a Gen 4 unless its a shop that will let you try out.

 

If I were using full wheel, which years are a match to 2017 P4?
From 2010 will fit?

 

From 2010 through 2022 for sure. Basically, every year with 195/65R15 stock tire is going to work. If it's just the rim, the second gen maybe also works, not sure, having tire size 185/65R15.

Minor rant: me and the wife walking our dog troop this morning, opining on a Ford Expedition parked in driveway: a relatively beefy vehicle, looked to be 17" rims, with a decent sidewall depth, making the tire OD fairly generous. Then there's the 5th Prius, Toyota's mpg "flagship", up here the only wheel size it comes in is effing 19". I think they've lost sight of the prize.

 

If memory serves correct, gen2, 3, and 4 are all 5x100 bolt pattern of similar sizing and center bore. If you are talking actual tire size, a gen2 was slightly smaller/narrower tire overall vs. gen3 and 4 which both start at 195/65R15. Having said that, any of the “full size” will be too fat to fit in there without raising up your carpet deck height. Hopefully that makes sense. If one were crafty with trimming the foam, you could perhaps make up for some subtle wheel/tire differences. But the factory donut is super narrow. Even without any foam, I think a stock 195/65R15 will push the carpeted floor panel up at least a few inches. Other people on this forum were ok with that, but I was not, so I just stuck with a skinny donut.

 

For Gen 4, the only vehicles I know oof with a full sized spare were sold in Israel.

 

and @Optimus
The dealer gave me the part for the alloy wheel -> 42611-47441
According to eBay its only for Gen 4, 2016-2022!

In other words, the Gen 3 wheels are of different part # compared to Gen 4 - but you guys seems to think that it will still fit - if it fits as a spare why not. But if I find one at junkyard they will not let me return it! With tire and CA environ fee, they many not be cheap/

I can not figure out why the part # is different.