Not sure if you need these pics, but here are some axle shaft pics.
They are comparison pics of 78-79 F150 shafts (760x Joint) to 71-77 Early Bronco (260? Joint).
The new looking shaft in the pics is a custom shaft from Bronco Graveyard that is EB length with the 760x joint.
There is also a comparison if the cheap replacement 297 joint vs the actual Spicer 760X
75 LP EB carrier
297 vs 760
Fullsize shafts vs EB long side
Stock EB vs 760 yokes
EB vs 760 shafts
I had to trim about a 1/2" off the short side inner and about a 1/4" off the long side inner since the blocks in the spool push the shafts out a 1/4" on each side. The fullsize short side inner is 3/8" longer than the EB from the get go.