Brazilian Dodge Dart 76 (similar to 69 usa)

That is the same bumper as a 69 Dart yes?

bumpers - yes... with a small difference. Plate space is a bit larger in Brazil.

For all other parts, I bought on ebay (or rockauto) using 68-69 darts as reference.

The only part I have to took a few more seconds to think before buying was lower arms.
Most of 68-69 darts lower arms US fits front drum brakes. In my case, I bought front disk brakes lower arms.

Despite the mechanical equivalence, interior parts (as cluster, seats, etc) are custom made to Brazil.