If it is the D shaped end, you will be taking a trip to the Jayco dealer. I needed one of those for to operate my slide out manually and was told by camping world, that it is a Jayco only part, and not availible in the after market.
I bought a Gator grip socket from walmart and it did fit and didnt slip, but the gears must have been froze so I wasnt able to move the slide out with it, so you might try one of those sockets if the dealer isnt convieniant
'97 Jayco Eagle 314BHS
'03 Tahoe LT 5.3L