Nathan, Just in case it helps when calling local yards to search for what you need, the arm listed as GM# 3685153 has a casting# on it that should read "3685157". Typical of GM to mark something with one casting number, but ID it under a different part number. dang

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
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)