Fa 50 was also used on 69 gt350 boss 351 71 429cj scj mustang as well as many other cars and the filters chris made were of my assembly line wire type mesh NOT the service replacement round hole type mesh. fa41 was 67 and up mostly big block and performance cars 390 gt 428 cj scj boss 302 -429 etc. This is a much needed concours part and the assembly line type were never serviced and nos autolite filters are rare and expensive and have dried up. The fa50 and fa41 airfilter is a highly visable part on KRs 69-70 shelbys boss 429s boss 351s 71 429 cj scj mustangs cars that have an open element ram air assembly where u ca see the filter inside the air cleaner base when u open the hood. Also wouldnt the c7sf fa 41 be correct for 67 gt350s.