Found a source of LINC-MERC front disc kits - https://jamcosuspension.com/product-category/brakes/lincoln-brakes/front-disc-conversions-lincoln-brakes/


They must have the correct info on changing from TREADLE-VAC pedal linkage to a diaphragm booster.

EDIT -

Here we go, the thread that started all of the wondering - https://www.jalopyjournal.com/forum/threads/1954-lincoln-brake-swap-question.1271208/

Now there is a poster on 'THE OTHER FORUM' that says he connected the replacement kit diaphragm booster directly to his 58 EDSEL TREADLE-VAC pedal linkage, but as I read the thread, he kept 4-wheel drum.

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I talked to Dave just a few months ago. He said that I shouldn't hesitate to call him if I need anything. 

Then his health must have improved then.

Is he still operating the business or just doing piece work?

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BTW - 

1954-1956 FORD and MERC use the same spindle as does the 1955-1957 BIRD, 

The LINC spindle is different.

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