Dusters are coupes, so you have that B pillar issue.
There was a nicely done 73 Scamp vert on ebay a couple years ago.
IIRC it went in the 4K range. Must have been a terrible loss compared to build cost.
The OP suggest a Scamp or Swinger for parts, but IIRC no Scamp or Swinger (ex 1969) verts...