67-68 front disc brake low pressure switch

[SSMUNDY]

Can anyone tell me what is correct for a 1967 Camaro with power front disc brakes. I am refering specifically to the splitter block that has the low pressure switch. I have seen them for sale in both brass and cast iron. The cast iron one I bought new online has a drip that I cannot fix. I am going to replace the block and want to get the correct one.
Thanks,
Sean

[BlackoutSteve]

OE = cast iron.
An original used one should be an easy find on eBay..

I bought 2 new repro Rear Brake Line Pressure Regulator Valves and both were faulty from poor casting and or machining. Both had leaks impossible to fix. They sent me a free replacement (a 3rd) and it still has a drip.. 
See the bubbles at the thread root?
Drove me absolutely mad until I figured my flares were good and not at fault.

Just saying.. Try to buy an OE distribution block if you can.

[SSMUNDY]

Yeah, I replaced the line twice, with no luck. It was only a drip, and the brakes work fine, but it leaks onto the frame, and that's just not acceptable. I'm a machinist by trade, and I see a lot of crappy machine work done on reproduction parts. I guess I will try to find a good used one instead of getting another new(made in china) one.  Thanks for the insite.