I see they've reverted back to the Western Reds colours of red, gold, black, and white.
Personally, red, gold and black is all I think they needed.
I'd stick with a predominantly red jersey (with black as a secondary colour and gold coming in 3rd ... basically the revamped 2012 WA Reds jersey with gold replacing the silver) for the 'main' jersey.
The 'alternate' jersey would then be the same jersey but with the gold and red switched around.
The heritage jersey could only really be the 1995 Western Reds jersey.