I'm probably gonna do the 80 series locker conversion and I was wondering a couple of things. Where can I find PN: 43412-60060, the front Long side inner axle from a 70 series, pre 1991, non-us? And since I have to change the ratio to 4.11 like my rear do I have to buy a new ring and pinon made just for the 80 series, or can I just find an old set of stock gears from a 40 that are 4.11? (are the ring and pinon sets from a 40 and an 80 interchangeable?)