I recently removed and cleaned the throttle body on my 97 VDP. Huge difference when driving and throttle is super responsive. I installed an aftermarket IACV which came with a red O Ring but no spacer or gasket. I did not use the O-Ring - I re-used the spacer washer and gasket (both in good shape) with HEX (Allen) keys screws and split washers.
As I am still dealing with a small idle issue I ordered an aftermarket one from one of our trusted suppliers. It came including:
b.Screws & O-Rings
d.Aluminum Spacer Washer
What is the red O-Ring for in addition to the spacer washer and gasket?
Interesting that the stems on the aftermarkets are shorter than the original one.
Incidentally when I cleaned the original I found it easy to move the cylindrical part and was concerned it might not be seating correctly when on the car. Perhaps someone who has cleaned and re-used the original IACV would comment.