i had 2 ecu's in my closet i looked up the numbers on them (yw4t-13b525-ba) and (yw4t-13b525-bb) i looked them up they seem to be the body/chassis control module for 99-0x s type... i can upload pix but they look just like any other control module... i was trying to id them because i would like to sell them(price,name,model)?? I dont own and never owned a jag so i have no idea how i had these in my closet... they also both say front electronic module..(fem-bh) and (fem-b) thanx for the help guys