matt, dont be so sure. gsf list a cheaper matrix but only for the MK2, and they have a more expensive matrix listed for both the MK2 and MK3. if the cheaper MK2 matrix was specced for non-heater valve cars, why is it not also listed for the MK3?
One will be chinese replacement grade - made of paper, weak, sh!te..
One will be chinese or german OE.. proper buisness..
Same OE number though..
It's like cheap sh!t blue temp senders vs ELTH+ or OEM ones.. they all look the same and have the same part numbers, different resale companies will declare them and cateogrise them different ways.
my source is the fact my boss started at the dealer in 1987, and worked in the swedeutsch/uro/gsf network