My local Ace hardware carries a complete line of Hillman fasteners. I found some solid steel rivets that worked well for reattaching the springs and mounting tab. I think rivets were 3/16" diameter but can't remember - maybe 5/32" diameter. To set the rivet I found drilling about an 1/8" hole maybe an 1/8" deep in the center of the rivet made them easier to peen. A heavy anvil and a punch to peen was used to set the rivets. Rivet a couple pieces of scrap together to get the hang of setting them and how much material to remove from the center of the rivet.
I was able to reuse my Nylon adjuster blocks but the screws was dead. Replaced with Dorman # 42119. (a little longer but they work) Also, the 1/4-20 square panel nuts are available from McMaster-Carr part number 90680A135. Pack of 25 for $10

Hopes this helps.

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