Nick - You have the Group 4.652 outlet nut and copper seal washer already on your master cylinder (see marked up pic of yours from your post).

See the next screenshot snagged from a 1929-57 MPC that has a better picture with the parts you're missing labeled. Your '50 MPC diagram has them present, but not identified with their parts group info, making it difficult to find them in the listings.

You should be able to locate the part numbers for those Group#'s, but should know that the bolt and connector aren't easily found. Usually those pieces will need to be scrounged from a donor truck or master cylinder where they still might be installed.

PS - It looks like your previous owner didn't run the brake line going to the master cylinder properly. Maybe Utah John can chime in and offer pictures of his master cylinder and brake line connections.

EDIT NOTE: See my next reply below for corrected info related to the mis-marked master cylinder diagram.
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Last edited by Gdads51; 07/19/2026 1:41 PM. Reason: add EDIT NOTE
~ Dan
1951 Chevy 3 window 3100
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