I have old fender skirts with number 337637 on them who can tell me what they fit?

Answer 1

Looks like a GM part number to me---call a GM dealer parts department and see if they can check the part number as being discontinued and what car line it was for...Buick, Olds, Pontiac, Chevrolet or Cadillac. Then check some old car clubs for old parts manuals for whichever car line the number is for and see if they can look up what car it fits. Lots of research involved.