New Moog u-joint cap kit.  This is the strap with bolt design (aka late model) with 2.145" end to end hole.  YOU MUST MEASURE YOURS AS THERE ARE 3 FACTORY SIZES + AFTERMARKET YOKE SIZES!  Fits the following:

70-81 Camaro (all models with 10-bolt, factory shaft and rear-end only, see note below)
70-81 Firebird/Trans Am (all models with 10-bolt, factory shaft and rear-end only, see note below)

NOTE : Some early 70's models used a u-bolt with nut design (1.75" end to end hole, non threaded yoke holes), a strap with bolt design with 1.85" end to end threaded holes, and this strap kit (2.145" end to end hole, threaded yoke holes), so check your yoke before ordering.