2011 Prius Gen III 16" Stock wheels, lug nuts

They will fit your 15" alloy wheel. The 2011 came with either 15" or 17" wheels.

Why only 4 lugnuts? The lone review also stated that the lugnuts are prone to rusting as well.

These are highly rated, and are a set of 20 for a lower price:

http://www.amazon.com/dp/B01JCO2BK6/ref=cm_sw_r_cp_apa_QH85ybFW4BBT9

 

The second set you linked isn't the proper seat (acorn) for your wheels. You need the mag style with the captured washer.

Also, if you do buy the mag style lugnuts from Amazon, save a few of the original lugnuts with your compact spare tire. The original lugnuts have an acorn type seat at the end of the lugnut that properly seats in the spare's steel wheel.

Edit: disregard, upon closer inspection, they do have the proper taper at the end of the lugnut to seat properly in the steel spare wheel.

 

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I got these, to replace the 4 locking nuts. They appear identical, work fine. There's an embossed number on one face (forget what), but it's subtle, and not visible when installed. My price (in March, 2016) was $17.27 (Can) which is still pretty steep, especially if you're needing to buy 20. Maybe just google that description for better price:

Maybe easier since I swap to snow tires with a separate set of lug nuts every winter, but if you want these lug nuts to last: wax them yearly.

 

I just used those same 73137TB to replace the wheel locks on my Gen 2. $12USD

 

I picked up a spare set of five genuine Toyota ones for cheap (from a PriusChatter who was parting out). Why?

Any time I rotate tires, I can line up all 20 from the car under the light, pretty easily pick out the five that look worst, swap in the spares, and put the car back together.

At leisure, the five worst ones I swapped out can be cleaned up with Nevr-Dull. I've never had them not come back to looking new, even if they looked all rusty and dead to start with.

Nevr-Dulling a bunch of lug nuts is kind of mind-numbing work, but at just five after each tire rotation it's only a couple minutes and at least I have that much patience. The quality of the Toyota nuts probably is better than any cheap replacement, so keeping the originals nice seems like a win.

I also take that opportunity to add a dab of antiseize in the only place I put it: just hidden away in the tiny gap between the top of the captive washer and the bottom of the nut. Turns out that's the only place I need it to keep the nuts torquing on and off smoothly.

-Chap

 

I've got extra lug nuts if anybody needs them. I have maybe 2 full sets.