I'm not able to find a correct replacement vacuum advance for 57 y-block 292 engine. It needs to have a straight linkage as shown in first picture below. All I'm able to procure is offset linkage as shown in second picture below. No suppliers show good pictures. Distributor is marked with "FoMoCo FEU-12127-A " as well as "FEK12131-B ". First picture below shows the damaged existing advance. I expect prior owner tried to rotate distributor with length of pipe over the vacuum fitting and bent it. I've ordered replacement twice and gotten offset linkages. First supplier was Amazon. Second supplier was Dennis Carpenter B9AF-12370-A (shown in second picture). It looks like LMC 47-1414 might be offset link as well, but it's hard to tell. Does anybody know where I might find one? I haven't seen anything from ebay either.

You need FORD PN B7A 12370-A which will have to be found NOS.

GOOGLE the PN.

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If you fail to find that vacuum advance chamber on EBay, then you can try some of the older Ford and Thunderbird parts suppliers.  That same chamber was used on the 1957-1959 Ford, Mercury, and Thunderbird cars on the Y-Block, FE, and M-E-L engines.  There’s probably someone out there making new replacements or rebuilding the older ones but a quick search did not find those.
 
Here’s a link I found for a new old stock unit.
1957 1958 1959 ford / thunderbird vacuum advance new ford nos # B7A-12370-A 

Lorena, Texas (South of Waco)

here too
https://classicautoparts.com/distributor-vacuum-advance


1936 Ford 3W Coupe : 56 T-Bird 312, 47 Packard 3 speed, 40 juice brakes.
1968 Merc Cyclone FB GT 390, Getting a better front clip!
1977 Ford F-250 Supercab RWD Explorer Long box.
1976 Chev Camaro RS LT
Future rebuild : 1949 Ford F-1

Thanks everybody, I got one on order.  I'm all set and looking forward to getting everything put back together.

Also be aware that this style of DIST has a single breaker plate and it rides on ball bearings underneath. If the bearing balls go bad, the breaker plate may not advance or retard correctly.

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