Mariner w15 . Need waterpump impeller . Cant identify serial# for impeller needed

Hey! I recently bought a used mariner 15 HP 2 stroke outboard . Turns out it needs a new waterpump impeller. And I have been on a journey since. The serial number looks to be worn off the cover from sun. But it does have a what looks to be the MOdel number on the transom swivel. It says "mariner w15 662 L. 301142 made in Japan " the motor block etc have engraved numbers. All starting with 662 . I have called around everywhere even had the gentlemen here at marine engine on the phone. I have no idea what to do to find out how to identify this outboard so I can know what parts to order for it. Mainly impeller. Thanks! I tried posting photos but had trouble. Am going to try to post photos again after I post this message

Even a Marine Engine .com parts guy couldn't ID this engine for you? Call them back and ask them to start reading their own forums for help.

Your engine serial number 301142 is coming up as an 1987 Mariner (15 HP W) Model Number 7015327.... L = Long shaft.

Though you'll want to try and compare designs, etc. found in the parts guide, Your Impeller ought to be found in the following link, http://www.marineengine.com/parts/mercury_marine_parts/sn/00301142/ 7015327/701_17

Here's some completed parts catalogs for you too,
http://www.marineengine.com/parts/mercury_marine_parts/sn/00301142
https://www.boats.net/catalog/mercury/outboard-by-year/mariner-outboard/1987/7015327
https://www.mercruiserparts.com/w15-662-001846-and-up

Good luck.

Awesome! Hey thanks a million! Yeh I was becoming very concerned I just bought an engine I'd never be able to use. I called marineengines. Twin city outboard. Crawling. Called this oldoutboard.com lol. Awesome deal though. I still have the gentlemans extension at marine engine. I'm about to call and order the parts I need thanks alot! One more question though. When I looked at the impeller I saw a Sierra and a quicksilver brand. Are those just brand options per my choice or do they have different dimensions and I need to choose the correct one. Thanks in advance(scrarch the impeller question thanks again!)

Quicksilver is the Merc (OEM) brand.

Sierra is an aftermarket company which usually sells parts for a little (to a lot) less than Merc. Most Sierra parts are "as good as" OEM an in a couple of cases, coils in particular, I prefer Sierra over OEM.