air filter for old style cowl

[tim rv415tp]

Can anyone tell me how to put an air filter on, or have some some pictures of a filtered air box for the older style rv-4 cowl, 1990 vintage?

 

[wyoflyer]

older style cowl on rv4

Tim,
Do a search on "tight cowl / airbox on older RV-4". Smokeyray has a pic for you. I fashioned one out of fiberglass, but aluminum would probably be easier.