whatever is stamped on the mast will not be of any help, those are mast series numbers which could be used on several different model trucks.

you should look on the frame of the truck for the serial number
look around the battery or opposite side beside the hood for any stamped numbers in the metal, or along side the floor step area.

as far as posting links in this forum , yes it does strip out full links but if you alter the link by removing the http or www part it will let you post the main part of the url, we can figure out the rest ;o)