Hello,
Thank you for your feedback regarding the set of 4 valve stem.
This white one is for the admission valve and replace the original black color from original Ducati ?
Regards
Gabriel
The white one is the old silicone used as stock on the Ducati Bevel Gears models and it was used both on intake and exhaust valves: if you want the newer version then you should take both green color valve seals
clic aquí para ver el link and black color
clic aquí para ver el link