I admit to having a new 2wd one.
last offer i had for it was over £400 and I don't plan to sell it, sorry but its for when my Saff might do concourse.
Ford replaced the design immediately on arrival of the 4x4 model and soon all you could get was the new tank and 'adaptor' pipe. So from recollection it was superceded around 1990... as the new 'kit' was always sold.
If you find them Jimmy I'm up for another for the 500 one day?