Aftermarket floor shifter for 727

OK full disclosure, I'm an AMC guy. Just happens that my '68 AMX has a Chrysler 8.75 489 sure grip 3.91 rear that I broke last year drag racing. Found a replacement 489 chunk on this forum a few weeks ago and installed a few hours ago. Everything was going well until it came time to hook up the driveshaft. My old 489 chunk has a 7260 Yoke with U-bolts. The new one has a 7260 Yoke with straps. The straps don't tighten near enough, u-joints will fall right out. U-joints are Spicer P051. I measured the U-joint cap and got 1-1/16".

So can anyone please tell me:

Is there a different U-joint size I now need for straps?

Also, why doesn't the yoke -w- straps have a lip on the end to hold the u-joint in place like the yoke with U-Bolts?

How can you tell if the driveshaft placement is correct without those yoke lips ensuring proper placement?

Finally I did find the following girdle @ Summit that is spec'd for a 1-1/16 U-joint. Wondering if this would solve my problem quickly?

http://www.summitracing.com/parts/mor-85850/overview/

Thanks, appreciate it.