Yoke size

That 727 slip yoke looks like a newer version and not a 7290, does that slip yoke have outside clips ? 7290 also doesn't measure 2.750 for its lock up dimension

Measure the cap, if the cap is not 1.125 it's not 7290 as i suspect from the picture, looks like 1330.

If you're shaft is 7260 and the slip yoke is 1330 you're going to be stuck with junk joints as spicer discontinued that joint, or have the weld yoke changed in the shaft if you need it shortened. If you have 7290 at the shaft and 1330 at the slip yoke you need a 5-794