Enjoying a nice mug
AO Silver Member
Join Date: Oct 2008
Location: United Kingdom
If it's the same as the one on a 156 there are two gaskets - both are installed without sealing material, I reused both of mine without any problem but you could get new ones if you felt that the additional expense was worth it.
Thinking about it it might be worth using a little spot of sealant just to hold them in place as they are a pain it try to fish out of the engine bay if they fall off.