Do those 2 items with the different numbers look similar? If so start asking all the relevant questions as to what it is suppose to fit and make and supply accurate measurements on your truck to find out if it will fit. I understand that it is always nice to have the original part on a restoration but sometimes now we may have to compromise with something similar and if questioned about it you can always ask how much they want for the correct part.
Cheers Cobba & Cobbarette
Coopernook, The Centre of our Universe.