Loook at rear cross-member. 6 holes where tow hitch fits. On my meanie the centre of the holes on left of the group is 28 1/2 inches from cross-member end. Distance from centre of holes on left group of three to r/hand mount is 6 inches, to l/hand mount is 15 1/2 inches, inset 3/4 inch from edge. Reinforcing plates are welded on the two points where step meets cross-member, looks like m8 bolts.
If it doesn't fit, I was never here.
re-reading, you may have meant the passenger doors rather than the back door. Not measured them, they fit to underside and chassis on a three-point fix.