Cheap Wideband o2 sensors on ebay.
I've already bought one, and it looks the part, dunno how it works yet tho.
They are 6066 type so not strictly an LSU 4.2, but theoretically will work with JAW amongst others.
Don't you just love badly listed stuff?
http://tinyurl.com/cqk7pxNeil, if you want to move this, feel free, I thought it better here for now instead of nestling in the "Parts for sale" bit.