Help on u joint id and brand reccomendations

Hey everyone. Was doing my routine check this morning and discovered that my rear u joint has some play it when i turn the driveshaft back and forth. Im not comfortable with it so ill be replacing it along with the front u joint and tailshaft seal. My question is the rear axle came out of i believe a 68 gts not sure on the different pinion yokes But i had to have a driveshaft made when the car was built. it appears the cap diameter is 1-1/8” diameter and the width is about 3-5/8” across from cap to cap. Any idea on what size u joints these are? I usually stick with spicer but Any other brand recommendations? i guess i cant complain, had its fair share of 4k clutch dumps and chirping 2nd gear lol