Dimension or part number for aftermarket ATC 110 air filter

[crackshot]

I need O.D. of atc 110 air intake side of 16 mm stock carb.
I want to put aftermarket air filter on it or if someone has a part number for UNI or K&N it would be a great help. I want a correct fit.
Thanks

[MTS]

this one will fit from K&N
http://www.knfilterchargers.com/search/product.aspx?Prod=R-1100
one im gettin for my atc90.. also fits 110