Brake speed bleeders

[Npbates]

I have an 06 GL1800 with a Champion kit. I want to add speed bleeders to rear brake caliper. Does anyone know which auto rear end Champion uses. I was told VW but not sure which bleeder valves to order. Thanks Gang.

 

[Marc H]

Calipers are 70s VW.They used a few different rear ends.