I have three Cal Custom 4-1/2" inch air cleaners, two of which I ran on a Chev 235 inline 6 years ago, so the third one was never used. I don't have the filters, just the bases and chrome covers, however the air filters are available from Speedway, Summit, Amazon, Napa etc. The chrome is in pretty nice shape given it wasn't super high quality originally. I modified the bases so they have a threaded stud with an acorn nut on top. Originally they had a speed nut on a solid stud but that wasn't real secure. The third unused base is bent but can be straightened and easily modified like the other two. Base opening is 2-5/8". $15 USPS Priority Mail shipping in the U.S. SOLD!