I'd bet $$$ they're just the Transtar R/B kits in a plain white box with a summit part no. sticker thrown on it.
I usually just get my R/B kits directly from the local Transtar jobber warehouse,hell you can order their kits pretty much anyway you want,which is nice as you get the kits built exactly the way you want 'em.
For instance if you want the "good" high flow filters instead of the low grade dacron junk filters most kits come with,they'll throw those in there for you,and you can leave other things out like the modulator if you have a RMVB that does'nt use a mod.
Pick your own frictions and steels,pick your band(s),add any HD hard parts you might need,you name it,they'll probably take care of you.