They were available in the same two colors available on '69 Plymouths. Yellow from the Barracuda and Blue/Aqua from the Satellite.
I don't have the production numbers for all the Plymouth E-bodies so here are the numbers built according to the Mod Top Registry. They look pretty close to me.
Barracuda Blue 26 'Cuda Blue 17 Barracuda Yellow 26 'Cuda Yellow <15
Steve Juliano has a Yellow top Hemicuda and may have acquired a blue top Six Pak car too.
I have pics of a few of them but can only post this one. Sorry.