8 3/4 Yoke Issues, U-Bolts? Big Straps?

So it looks like you already have a mongrel u-joint (no c-clips on one half). You sure cannot use the u-joint with that yoke. I'll bet you just need a regular "7260" u-joint with c-clips on both halves. If the yoke measures 2.625" between the flats where the c-clips sit, that's what it looks like you need.