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**HO455** · 01-22-2021, 06:29 PM

After some 50 years it's quite possible that they may have been replaced in the past with a larger splined version. So to be sure of the spline size I would remove one and measure it before purchasing any replacements.
LMC has a listing for them, but some folks had problems with fitment, likely from the originals being replaced in the past by a front end repair shop. If the repair shop spun the bolt with a an air ratchet they would just drill the hole larger and replace it with the next larger spline. Back in the day some shops installed new bolts as part of the front end rebuild.
Dorman, NAPA, and ARP carry many sizes.

01-22-2021, 06:29 PM	#2
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,889	Re: Source for front upper control arm bolts After some 50 years it's quite possible that they may have been replaced in the past with a larger splined version. So to be sure of the spline size I would remove one and measure it before purchasing any replacements. LMC has a listing for them, but some folks had problems with fitment, likely from the originals being replaced in the past by a front end repair shop. If the repair shop spun the bolt with a an air ratchet they would just drill the hole larger and replace it with the next larger spline. Back in the day some shops installed new bolts as part of the front end rebuild. Dorman, NAPA, and ARP carry many sizes. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377