273 Commando air cleaner ?

Next photos are the s/s base with the cheapie 4 bbl base.If you want to do some work the 4 bbl base fits the s/s base groove that is stamped into the 1 bbl base, cut away the 1 bbl and weld or JB weld and use the slant filter and hat. The last photo is what you end up with and works just fine.
Hope this helps..