Never on a North American-sold WJ, but I've heard rumors they were available on European-market export WJs. At any rate, I believe in terms of axle shafts the WJ D30 is unique, at least the inners are. Any ol' D30 outer stub will work but the inners are a WJ-only length. Some guys on Mallcrawlin had Dutchman Axles make up some custom 4340 inners for around $300/pair that they mated to regular-stock 4340 outers and 760x joints. Alternatively, IRO has a full chromo U-joint conversion kit for the WJ but it's pretty spendy at $800.