Indy

Hey folks,
I drive a '79 foxbody 'Stang. I have the original lap belts in the backseat. My problem is my daughter is now big enough for a child booster seat, which in Ontario, Canada require the use of shoulder belts. My question is... what foxbody Mustang came with backseat shoulder belts. I want to scavange some to install in my car. Anyone out done this very important upgrade? Any tips, advise or information would be greatly appreciated. My kids safety is Job 1 here and she definately will not go a summer without riding in Dad's "Horsey Car"!

Thanks in advance,
Indy