OEM spare tire install

Wasn't it upthread where small foam blocks were purchased from a craft store?

 

I tried to read all 500+ posts in this thread but did not see that!

I've handled the Walmart yoga block and it does look very suitable. It's very firm and very light but has to be cut to the right dimensions.

 

Ok. I've got nothing else to do....lol.

 

I misread your post. You have an XLE. I was thinking LE.
@Humble Bear cut a hole in his LE's foam to fit the tire, but then had to add foam blocks to raise the deck (LE).
He got small craft blocks from Walmart.
SPARE TIRE MOD FOR LE FWD model using factory foam | PriusChat

 

The donut fits perfectly behind the passenger seat, with the seat being all the way back.
I put the tire in a black plastic bag for camouflage purposes.
There are existing cutouts in the foam for the oem factory jack and wrench, and they fit perfect.
The lower LE deck helps with space. Not sure how a bike will fit in there yet.
Thanks again to @Hammersmith .