rearend identification.

[johnny209]

i have been searching the crap out of rear end identification for chevy 10 bolt rear ends and can not find any information on this, here is the issue i got into . i bought a rear end off a guy from a 68 p/u i looked at it and it had trailing arm mounts etc i thought it was odd it was a 10 bolt instead of 12 but whatever it was in a truck and i need to get mine going. got it home and it is measuring 69 inches from wms to wms. it has a 5on5 lug pattern which confuses me. what vehicle had a 69 inch rear end in it and how horrible will this look on a pickup. that is 3 inches wider on each side over the stock rear end.