One thing I've found out - the aftermarket fender well inserts are apparently a slightly different shape than the originals (we had that discussion here some months ago) and not all tires fit smoothly into them. From what I've been able to tell on the two 30/31 cars I've had with aftermarket fender wells, Goodyears (which are a true 4.75x19) fit, but Firestones and a lot of others (which are 4.75/5.00x19) don't - you have to deflate them to get them in, and if you then inflate them you can't get them out. I haven't tried the new radials but typically radials have a softer sidewall so I suspect they won't fit either. I was originally going to do just as Charlie describes on my '30 restoration but decided to keep the rear spare and put the trunk rack on the extended mount.