Ya had the same problem, started fitting the new leatherette seat covers yesterday, passenger seat was cool as, flew through the fitting. Looks great, problem with the drivers side. COULD not get the screw on the Belt guide off!! totally seized, wd40, the works, not a mm. ruined the screw thread. In the end just removed the whole thing. two tiny spot welds hold it on. Gaff taped over the hole and tidied up the foam, little repairs here and there. I just carried on recovering the seat, looks great, you wouldn't even notice the missing belt guide.
Just realised I've been no help whatsoever to you...just to let ya know i shared your fustration...@@***@@@ pain in the ar$e.
