Much to my disappointment, the F104 narrow front end, takes different screws than the F104w front end does. So.. I couldn't drive my car last night. AAAAand I found that the shimazo tires require foam rims, instead of the lipped rims. So that didn't happen either.
I like the round carcasses, and wide, full, foams. The foams that came from tamiya were.. only like 1/2 the width of the carcass, and less than 2/3 the height of the tire.