Hmmm... This one has me a bit raffled.
As for the "2 timing belts" I've heard of that in the past but it was usually in reference to the difference between the phase 1 and phase 2 engines.
I searched the part numbers for the belt and it does look like Subaru specs a one belt (13028-AA21B) for the Legacy 99-05, and a different belt (13028-AA231) for Impreza, Forester, and Baja of the same years. It also covers some models in the 09+ range.
Why the difference? I have no clue. Never knew there was a difference, and I'm pretty sure I've put a few of those Aisin TKF-001 kits on a few Legacy/outback models from the 00-04 years. Although admittedly, the only thing I've ever paid attention to in the listing is the water pump, Front t-stat vs bottom , and the tensioner.
Aisin does list a kit TKF-010 that they say is for the Legacy 2.5 99-05, though I can't find anything to verify that the belt is the only difference. I guess I'll order one and see what the deal is.
Either that or get my hands on the two different belts and see if there's an actual difference other than the part number.
IDOSubaru thanks for the link above. Searching their site I found this: http://aisinaftermar...ed_NOV_2017.pdf
Which lead to the info listed above. It looks as though the TKF-007 kit was originally intended to cover the 00-05 legacy, but the info wasn't properly listed. Amazon says TKF-007 fits 01 Legacy, so does Rockauto's interchange. https://www.amazon.c...Sc8L&ref=plSrchhttps://www.rockauto...onent kit,16088
< This one shows the superceded kit, but includes in the info the number for the old kit. out of stock.
Edited by Fairtax4me, 16 March 2018 - 10:26 PM.