Just in case anyone is hunting for an original FEL-PRO 2 piece rubber (neoprene, whatever - lol) seal, I found this older 1928-80 FEL-PRO Parts Catalog on the interweb. It lists the FEL-PRO # "BS 13363" as their back then part number for the seal for both the 235 (1955-63 - their designation) and 261 applications from 1954-62. Oddly their catalog lumped Chevrolet and GMC trucks together under the "GMC Truck" category. dang

The link is a great potential source for identifying old FEL-PRO part numbers if you're hunting some no longer offered products. wink

Best of luck Craig in tracking your seal down. thumbs_up
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~ Dan
1951 Chevy 3 window 3100
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1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)