7260 U-Joint girdle???

I'm getting my car dialed in and I believe when I get some slicks on it it'll be in the mid 12 sec. range. When I was underneath it measuring the pinion angle the other day it dawned on me I still have the stock bolt and strap type u-joint retainers. I'm concerned they may not hold up to slicks. I looked on Summit's site for u-joint girdles and something don't seem right there. They list the Moroso 85850 being 1.505 center to center using a .780 u-joint cup. Jegs shows it being a 1.505 center to center with a 1.0625 cup which is much closer to what I measured. But neither are exactly what I measured. I measured the cup diameter at 1.075 and the spacing between retaining bolts at 1.52 but the spacing measurement was pretty hard to do in the car so I could have been off some on that one.

I do know I have the smaller 7260 U-joint. Can anybody confirm the cup diameter and bolt spacing on it?

Thanks, Tracy