Aussie VC 67 Dodge ute

I want to fit modern "reel" type safety belts to the ute, a pet hate of mine is early cars with seat belt bolts right through the top of the B pillar....I cut open the pillar and fitted a reinforcing plate with a welded nut, and refitted the cover section....I still have to make a recessed lower mount for the reel to counter sink into...the lower mount shown was a rough test pillar for my 62 S series but the ute will be made similar...