@Michael McKelvey posted:Thanks, @Sacto Mitch.
with my little battery, I am able to slide the spare all the way toward the front. I don't know if that makes the fit better or worse.
When I was trying to determine the size of my spare, I found that sliding the spare forward (which is the way I mounted mine) makes it worse. The way the spare is mounted in Mitch's picture was the "sweet spot" to allow as wide a tire as possible in my car. A 155 will be really tight, if possible. The width of the wheel (either a '67-68 VW 15x4" or a more common 15 x 4 1/2") didn't make much difference. The width of the tire is what caused the interference with the lid.
BTW, you may be able to find a worn out tire at a tire shop for testing purposes.