Jeff-
Depends on the year of your TR4. Can't remember if you have an early one or later. Cars before CT22343 had a different checkstrap assembly (and different A-post I think). A thin looking pin was used to hold it to the jamb on the early cars (PN 612244 or 650216 maybe ).
Later models had more the TR6 style checkstrap, I believe originally that was a rivet, but people quite often use a clevis pin arrangement. I think TRF has the rivets, pn 616122. I didn't spot anyone selling the early style.
Randy