Part Identification

Joe Varley Part # 556326 group 3.609 from my 1950 March edition parts book is for a 1949 88 RH side exhaust pipe. By the mid 50's the book shows 557794 to fit 1949 & 1950 88 so we must assume it got changed to the new number. I'll see you in January at Barrett-Jackson, I will be ther

Part identification

I have a nice NOS "Y" pipe that I cannot identify from my parts books. I pulled it out of an old Olds dealer 30 years ago. Can anybody with parts books help to ID this pipe? Part # says on the metal tag on the pipe: GM1 556326 I have found numbers near this for parts around 1949-1950.