MAssey Ferguson TE20 TEA20 TED20 TEF20 FE35 23C Fan Belt 17 mm wide  with Water Pump is on cylinder head NOT the block 
For tractors with original positioned generator - not alternator (unless alternator has been fitted to sit in the same position as generator)Fits for Massey Ferguson570038M1, 570039M1, 636208M1, 826960M1