NEED BADLY: 99 PCM/ECU/ECM part #492AE

Like the title says i need a 99 PCM, and don't feel like buying it from the stealership. the specific Part # for this is 492AE. this is the only one that will work, there are others out of 99's that are 493AE and it will not work right. so any help would be much appreciated!

Dgiggity

I may have one. I have a couple from diferent 99 XJ's What' the dealer get for a new one?