You are correct the last 2 fittings I have listed are for the stock mustang fuel pump. Put the parts number in the jegs or summit website and you'll see. I used the '99 vette filter so I can't comment on any other years. Send me a PM with your number and I'll send you pics of what I got.Do you have any pics? I thought the stock mustang pump was 3/8th outlet and 1/4 inlet? I was planning on using the newer corvette filter/regulator. Aent the older filters different?