I went looking for a B66 this AM and found an older crusty one with typical splay bottom. IThe B66 is the one with a bolted-on rear top plate and vertical coil springs in the rear. I did find a bunch of B72 with similar top that are more in line with our lighter touring bikes and the B66 would probably be more in line with the three-sp[eed for which I am seeking it. I'll entertain a trade without money if possible
Larry Black
Mt Airy, Md.