You don't need to order a specific X9 air filter, it's identical to the one for the early 1980- carburetted VW Golf/Polo Rabbit? or K&N 33-2092.
Ufortunately I ordered one already and it's coming from Cyprus! Oh well. It will probabably last as long as I will own the bike.
I applied Cerakote to all of the faded an oxidized matte plastic parts and some of it looks like new. Really starting to like the bike more. Also ran about 5 ounces of Seafoam in 3 gallons of gas thru it and it's smoothed out a bit at idle now.