Oh, out of stock doesn't help!
The twist was easier than I thought it would be, used a heat gun, gently or not close. Already had a string tied to it, and with a little heat it came right through.
Edit: Sorry Gary, I missed that you mentioned LMC in your post. I played the game for you!
https://www.lmctruck.com/1980-96-ford/seat-belts/ford-buckle-sleeves