I have the number for 5/8" (5/8" fan belt Dayco #23425) but not for the 3/8" maybe someone can help you could see if Napa or your local FLAPS has a cross-reference number that you could use.
I am presently running a 3/8" belt on my new 1954 235 install let me check tonight and I will post any results tomorrow. I have a brand new 5/8" as above if anybody wants it they are 9$ new just pay postage and it is yours.
Last edited by Brad Allen; 10/06/2008 9:25 PM.