According to Mancini, they are the same
“Fits: A, B/RB & 426 Hemi blocks
OE Mopar engine block to transmission bellhousing dowel pin set.
Standard dowel pins - No offset
Works with automatic or manual transmission bellhousings.”
what year Demon?
pic 1 and 3 are 71 and earlier (no seat belt or EGR). Pic 2 is 75-76 (Seatbelt and EGR). pic 4 is 72-73 maybe also 74? (Seatbelt, no EGR)
Where did you get your seals? The ones I bought from DMT (Steele) fit in pretty easy but didnt seal well until I shimmed up the backside thickness of the rubber. The seal was loose in the roof rail groove. Kind of hard to explain but you could grab the edge of it and move it up and down within...
I think you have to remove the front and rear windows to properly install a cloth headliner. If you are staying with cardboard, that wouldn’t be necessary