masterk Posted May 2 Report Share Posted May 2 I just spent a bunch of time trying to find a replacement booster or booster parts for my 620 and wanted to give back some knowledge. It looks like the small 5 1/2" brake booster diaphragm from the early 73 and 74 620s is still available at Power Brake Sales and nowhere else. The part number for the diaphragm is 221-21100 and it's listed with only the description "117 DIAPH" on their surplus parts page. https://powerbrakes.com/piece-part-surplus-section-1/ Hope this helps someone out there! 2 Quote Link to comment
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