the cluster and its linkage should definitely be saved. if it's cheap enough I'd definitely get it from you and add it to the Jeep shelf until someone has the need. (the column should be saved too, but that's likely too much in shipping for me )
part of that is likely due to the mid 60s being a complete game changer when it comes to performance cars and thus the early mustang would be revered as such (especially since the HP dropped so substantially in the 80s). a 2001 mustang was simply not a game changer in any way.
fun fact, they made about as many 1969 Mustangs as all of the MJs put together.
not only are long and short different, some years mounted to the frame, other mounted to both the frame and bed. I wish I had taken better notes as I pulled all these beds. you'll want to crawl under and snap pics to help buy the correct one.