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If you've been doing any bodywork, you're aware the non-standard "old ones" are becoming unobtainium. Decades of plastic(nylon) has wiped out the market for steel which was the material of choice during this era.
Recently, I'm working on my other vehicle, as these '50s were "chrome-ites" and needed new clips for the abundant trim. We don't want our expensive chrome trim pieces falling off while driving! The only ones out there that would come close were the "universal" break off tab type but only come in 3/4" studs. I needed 1 1/4" for retainer clips used which span a seam.
I little ingenuity, those "studs" are pressed in now. I removed one and found out their called "self clinching studs" which are available in different sizes/lengths/thicknesses. Old ones were just rivet head screws with a square base, which are no longer made/available, similar to a carriage bolt but flat and smaller diam. so they don't turn during tightening. There's a lot of trimming to make a carriage screw fit.
I got some studs ordered from stock of the right length and they come for different thicknesses. I might be able to improvise others in place of the screws but waiting on out of stock inquiry. The ones I take out won't fit the thinner clips.
Getting increasingly difficult to go "original" in restos/repairs. Even if you find the big parts,the small parts are just not available and covid has wiped a lot of the slow sellers off the map. eg; I tried to ordered some "Au-Ve-Co" catalog items but they've obsoleted a bunch lately. The hobby shrink continues. You have to improvise, adapt and overcome, now. Plug OEM and play no longer an option.

Can you post a link to some of the parts you're talking about?

Always a fly in my ointment. The stud heads I got are 0.05" too small and they slip through the hole on the large clips. About 0.1 off for the pressed area. So, no fear, I'll weld them as the only "big" head studs are 3/4" long so the availability conundrum of not measuring up. I dechromed most of the P so won't be a biggy some day there.


For our "GMO" Packard enthusiast:
jhpfasteners.com/self-clinching-fasteners/studs#1
auvecocatalog.com/ pg 825 item 19378