Hi there, i think i know what you mean. You are on about getting a longer dogbone so it will go further into the diff out-drive. But the next bigger size up i beleive is a b4 dogbone. But when i tried these on the bj4we i had a hard time trying to get them on, and then when i got them on they were so far into the outdrive that the suspension wouldn't work. But i am not sure about any other ones that may fit. By the way when i say i had a hard time getting them on, i had to take the hub carrier of as they wouldn't fir otherwise.
Hope this helps you out a bit.