Try Numrich (Gun Parts Corp) or Jack First (do internet search for Jack). Also, about 20 year ago I reorganized the old, used parts at Sarco in New Jersey but it seems the original owners are gone and the company moved. They had everything but didn't know where or what most of the old parts were until I organized the parts. Would be worth a try as #3 on the list.

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ANTIQUESMITHS
LM1300 SWHF425