I exchanged two rear side window interior panels from a 260 into my 71 240 they fit perfectly. What I did notice was that the 260 interior panels were slightly thicker than the240, and were less suseptable to cracking. I know this does not answere your question but I must caution you that the interior parts (at least in the back on a 240 are thin and could crack on you if you decide to try and exchange them to the 260. Good Luck