My bad.

I'll correct myself on the 10 lb RPV cuz I shouldda not relied on my memory (I was at work ya know?).. 10 lb'ers are only used with drum brakes. They'll all be 2 lb'ers with 4 wheel discs.. After further review, I don't think you need them unless you're building a street rod with the MC mounted low.

Below is a pic from the Speedway Motors catalog. In contrast however, I would install the rear valve after the proportioning valve.