Thanks ferrarieeeee. The OFNA air filters do not come pre-oiled, so a bit of a pain and more expensive to buy both filter and oil. I ordered the MBX7 air fliter set and a pack of pre-oiled filters. I hope they fit as you say they do!

Below are links to the MBX7 air filter set and pack of filters...

http://www.amainhobbies.com/product_...Air-Filter-Set

http://www.amainhobbies.com/product_...-Air-Filter-12