SEEKING RECOMMENDATIONS ABOUT PROPER SHEET METAL PARTS - 1971 PLYMOUTH DUSTER FROM PERU

There were lot of Dusters sold in Mexico when I used to go there back in the '70s. Peru?
As for the K-member mount, Schumacher. I believe they make them in small batches and sell until they're gone resulting in a hit or miss for availability. Here is a pair for BB on a 6 that a member is offering.

Schumacher Conversion Mts. Big Block into "A" Body 6 Cyl. K Member

https://www.forabodiesonly.com/mopa...-big-block-into-a-body-6-cyl-k-member.523147/