Done and done, fits great, even a little extra room, with stock size, in an 03.5.
I removed the spare with built in sub long ago. (it is for sale/trade btw...)
I assume that the well is the same size on the pre 03's, but whatever.
I run 205/45/16 and they look like they will fit also, but they are basically the same as stock.
I only had to remove the foam in the bottom of the well, not from the underside of the decking. When I tried originally I dont think that I removed all my sh1t from the rear which seemed mostly necessary.
I think that a wider tire would sit up higher and distort the cardboard over time, but the foam you removed could p[robably be reinstalled to make up most of the difference...might need and additiopnal piece or two.
(attention)