I second Dave's comments about the quality of these tires. They come from a six part mold--4 quadrants for the inner tread and two halves for the outer faces--with almost undetectable seams. You must look very close to find them.
To convert a given 221 model to an "early production" version really requires these tires, early visor covers, and an MG13. MG13 ammo stowage would also help given the full Bronco interior. Bronco could have offered a more useful set by including, at minimum, the visor covers and MG13, which they already make.
However, since Bronco sells "early" and "late(r)" versions of this vehicle, I doubt many people will need these tires for a Bronco kit. But wait! The entire 221, 222, 223, 260, and 261 range of vehicles used the same chassis and wheel assemblies. The "early" pattern tires offered by Bronco definitely appear on 221, 222, and 223 vehicles. The 260 and 261 were manufactured later and I have not seen a picture of either vehicle with these tires. But in theory all 5 vehicles could use them.
Probably the best use of these parts is for improving an old Tamiya 222 or 223 kit. The Bronco outer tire and rim parts fit corresponding Tamiya hubs, leaving only a small gap on the backside of the wheel to fill. I believe the full Bronco wheel assemblies will mate with a Tamiya chassis assembly but cannot (yet) confirm this. The Bronco and Tamiya parts are almost identical, dimensionally. If you do this, make sure to put the correct wheel assembly in the correct position. These vehicles have mirror inner hubs, front to back.
For those who really want to get particular, there may be two versions of the "early" pattern tire, one with solid face chevrons and one with grooved face chevrons. I have seen both on these vehicles, but cannot tell if the former is a worn version of the latter. Based on the depth of the tread, I think not. Anyway, the Bronco "early" tires represent the type with grooved chevrons. For the tire conscious, there are also at least two version of the "late" tire--one with perpendicular V cuts and one with angled V cuts.
Hi Dave, I will trade you something for those tires if you don't want them. Just send me a PM if you are interested.
-Doug