i went to install my agr box in my 68 camaro and the steering coupler is too small to fit on the end of the box and i cant stretch the coupler to fit, is there a specific coupler for the new box?

Maybe if you started playing Call of Duty again instead of Rock Band like a homo. It's Karma man. Karma doesn't want pansies driving '68 Camaros. Don't you watch Carson Daly.

i went to install my agr box in my 68 camaro and the steering coupler is too small to fit on the end of the box and i cant stretch the coupler to fit, is there a specific coupler for the new box?

The AGR '65-'76 GM box uses the same 13/16 ragjoint as the original power steering in a 68 and it slips right on. If you are converting from manual steering, you need a new ragjoint. If you are replacing a power box, it's also possible that someone had already put a late model box into your car--'77-'92 use a smaller 3/4 ragjoint.