Disc brake master cylinder proportional and hold off valves
 

I took this off a 1968 Impala Station wagon with disc brakes. The casting number is 29881, there is a symbol that looks like GL5 at the front. I'm assuming 225 cast in a square is the date. You get everything as pictured.
Selling these as cores. This has been sitting on my shelf for 25 years. $150 plus shipping. Paypal or money order

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