Best direct to carb air filter for 912UL?

[dholly]

Which air filters to use when omitting the 912 carb heat system? Kitfox catalog lists the small K&N's, but I read several posts in the Matronics archives suggesting a larger filter was mandatory, and specifically mention K&N filter p/n RA-045V. What filters are TKF members are using, nothing came up in a search here? Looks like relocation of the coolant overflow bottle is required, any pics showing solutions appreciated. Thanks.

[edit] Also, forgot to ask how folks are safe tying the filter to the carbs.