So I never had to replace my parts, but did notice there doesn't seem to be a replacement master cyl available in any catalogs. In trying to figure out what I could use, I started with the assumption that there was probably about one supplier to the 70s Japanese mini-trucks, meaning LUVs probably have parts interchangabiltiy with Nissan, Datsun, etc. I did some digging on RockAuto. Based on the pictures and years, here's what I found.
1972 Nissan 521 Pickup 1.6 L -- looks like a direct replacement for the 72 Luv brake master cylinder (single reservoir).
1973 Nissan 620 Pickup 1.6 L 1595cc L4 -- looks like a compatable small size vacuum booster.
Other options ---
If I were to fit disc brakes and couldn't get a LUV disc brake master cylinder, I would use
1972 Nissan 1200 -- brake master cylinder (Dual reservoir, intended for disc brakes, may not need proportioning valve).
If you want to forget vacuum boost, which some Chevys [trucks, Corvettes) much heavier than LUVs did --
1968 C10 -- manual brakes (master cylinder is designed for no vacuum booster).
As for the 'hot rod' brake master cylinders that are sold by Wilwood, etc; I've heard they are just Dodge (Chrysler) part numbers but am not sure which one.
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