1600X20 FIT Happy days need to do some arch mods,, but makes them real fast,,,,, the sldt could do 70mph,, too fast yes but the 350 rolls could pull it, so at 56mph the rpm was reasonable and mpg was very good, A chap tried it on a drops but didnt go through with it,, But i see no reason it would not work as the sldt,, see pics of 1600x20 on a drops,,