forward look .com can rebuild old ones if plating ok , or a kit for you to do , substitutes shoulder bolts and spacers for rivets . There are several versions , early ones had small pivot rivets and often broke at rivets at top of ears . All of them the springs rust and break . The kit fixes both size rivets , but not a broken casting . Later service ones we think have large rivets and stronger casting in rivet areas
And the kit has a new spring .
The main purpose of the kit was you cannot disassemble to rechrome them without destroying the rivet . I had that problem on 2-3 cars . Has to be drilled out . Poor fit too , so a new rivet is loose and impossible to “set”
Plus same situation with broken spring which gives rise to a floppy handle . Have to drill rivet to get at that spring , then what ?
Forward look does not do rechrome etc . But a good looking one with bad spring yes , or loose / worn rivet etc can be repaired
To rebuild yourself , you take apart and get the two pieces plated , use kit to reassemble . Drill holes etc for new parts before chrome is best . Possibly touch up hole after .
Also , may have to file before plating where two pieces pass each other to be sure it does not scrape , factory fit is very close , sometimes adding chrome makes it drag .
Agree not easy to find , but I think 57-59 interchange on all Chrysler front doors , maybe back doors too . But often pitted they need new chrome . Chances of finding an unpitted one in junkyard are very low . So NOS . Plating expensive , but then it is like new . Probably better , factory plating not very good .
I think 60 up are reproduced , on ebay .
Hope this helps