Here is a new old stock original Bendix master cylinder with 1 5/8" filler threaded on the cap. Original on 1937 to 1946 Chevrolet and Chevy trucks. The part number is cast 49277. The cap is in excellent condition.
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It can be picked up at
428 Grasslands Rd.
Valhalla N.Y. 10595
I can ship it if you like. Call or email me your state and Zip code for shipping charges. Ask for George.