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Comment by Jason Edge on December 30, 2015 at 11:51pm

Tyler check out these close ups of my front bumper end I took a few years back:

http://6364cadillac.ning.com/photo/albums/front-bumper-end-project

Note that for bolts I will often veer form the purest route, and use what I consider better nuts and bolts available now especially for something sort of hidden. I remember I liked to use these serrated flange headed bolts and nuts for connecting the 6 bumper pieced together. For the rear bumper large bumper to frame bolts I went with new hardened #8 grade yellow/gold zinc coated bolts. So, unless you are trying to be a purest and go back with original bolts (or have them recoated to the factory yellow/gold cadmium), you can walk into any Lowes, Home Depot, or Ace Hardware and fine many equal or better substitutes. Usually you want the bolts to have the same diameter and be at least as long, but from there you can add in new serrated head nuts and bolts, hardened lock washers, slightly longer bolts etc.  Under the hood of my car I am more picky about  looking like it did in 1964 when you popped the hood and try to match that original look.

Comment by Jason Edge on December 30, 2015 at 8:28pm

Tyler, What are "these". The lower bumper center to lower bumper end bolts would be the same; the cornering light double end threaded studs and nuts should be the same, however you do not have the same park light extension (right next to the 63 park light) and lower grill extension double bracket on the 63 as you have on the 64. Let me know exactly what year and which bolt or stud you are referring to?

Comment by Jason Edge on December 30, 2015 at 3:36pm

The lower center bumper end to right lower end (bucket) bolt is a 3/8' x 24 bolt. Using the caliper the bolt length is approx. 1 3/32".

Looking at the very top row of bolts from right to left I see the 2 cornering light fixture to right upper bumper end studs and nuts (they are double side studs with nuts), the RH park light inner extension bolts and nuts, and then at the far upper left the lower bumper extension bracket bolts. With your description I am not sure which you are referring to as the core grill bolts are not seen in this picture.