Hi. I need to replace two broken bolt assemblies on our `75. One is for the lower radiator grille panel(#3954658) and the other is for the spoiler(#336125). I`m just wondering what thread size they are(appear to be 14 something thread) so I could retap the holes. Although they are different numbers, they seem to be the same bolt on our car. Thanks for any help. Brian P.S. Are they still available?
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Re: C3 Bolt Assemblies
Brian-----
The GM #3954658 bolt was once available in SERVICE, but it's been discontinued for years. The GM #336125 was never available in SERVICE. As far as I can determine, these were 1/4-20 thread size. However, it's POSSIBLE that they were 5/16-18. They were definitely one or the other. Also, both were the same thread size, as far as I can tell, but the lengths were slightly different.
To determine, for sure, what the thread size is, simply remove one of the bolts that's not damaged and measure its thread size. Many of each of these bolts were used, so you should have, at least, one good one to measure.
These bolts had a captured flat washer. You can use a bolt with a non-captured flat washer and no one will ever know the difference.In Appreciation of John Hinckley -
Thanks Joe *NM* *NM*
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