I got a XTX 5VK-8591A-00 should fit a XTR it has the white dot on the back so it is a reprogrammed 00 to 01 ECU so will ride smoother than the 00 ECU. The ECU when removed it was working perfectly it was on my 2007 XTX when I swapped over the wiring loop to get rid of the O2 sensor before & worked out how to control the O2 sensor, I removed this ECU & complete 2005 wiring loom when I sold my 2007 XTX.
Don't think it will help on your XTZ as this ECU runs no O2 sensor, as mentioned I do have the complete wiring loom for this ECU as well.