Only '66-'67 Dana 60s came with U-bolts, '68-up used the straps. The '66-'67 also used a Spicer 1330 joint instead of the 7290. IIRC, the 1330 caps have a smaller diameter than the 7290, they're about the same as the 7260. The yokes with U-bolt I've had were 5/16", can the 7290 yoke be drilled big enough and not be too thin?