Just got a Yazoo ZKH61253 (Husqvarna ZTH6125A) mower in the shop. It is a 2000 model per the Kohler serial number. Very nice well maintain mower. What the shame is that every part I look up is NLA. I manage to find idler pulleys in after market but the idler arms and bushings are NLA. The main deck drive (mule drive) moving idler arm has a worn out bushing and the arm pivot where the bushing is worn. I did manage to cut a couple sleeves of beer can aluminum to shim it for now but that will not last long term.
According last year's price list they were available but not now. Another nice bound for junk yard because the manufacture don't want provide parts now.