Need help finding correct yoke

['65 chevy lover]

I'm trying to upgrade my driveshaft to 1350 u-joints and I'm having trouble finding a yoke for the 12 bolt rearend. I have a Th400 trans and upgraded carrier bearing but I can't find the correct yoke for the rearend. Been dealing with Fort Worth Gear&axle and, they got me a 1350 yoke, but the seal won't work. They don't know where to find one that will work. So, question is, does anyone know where I can find a 1350 yoke that will work or, am I just going to have to live with the stock 1310. I'm including pictures of he 1350 yoke and rearend.