oil pump

i need to take time and do the 120k maintenence on my car but i am having problem locating a oil pump i found 1 on ebay for 100 bucks and one 3sx for 270 i would obviously would perfer not to spend 270 at 3sx but dont want to deal with any issue i might run into dealing with inferior part (being as it is kinda hard to get to) i did also see a 120k maintence kit but i already have all the other parts

i need to take time and do the 120k maintenence on my car but i am having problem locating a oil pump i found 1 on ebay for 100 bucks and one 3sx for 270 i would obviously would perfer not to spend 270 at 3sx but dont want to deal with any issue i might run into dealing with inferior part (being as it is kinda hard to get to) i did also see a 120k maintence kit but i already have all the other parts
I am close to Baltimore and my business partner is right by arundel mills if you ever need someone to do the work for you.

Only get the OEM oil pump, I would not risk getting one from ebay, They are like $195 plus $10 for the gasket, I don't know where you got $100 or $270?

The part number is MD190982 for a 4-bolt main car, 92.5 up, and MD175583 for a 2-bolt main car, 91-92.5

http://www.trademotion.com/partlocator/index.cfm?action=getJointLocator&siteid=213934&chapter=&sectionids=10,0&groupid=10035&subgroupid=20101&componentid=61161&make=24&model=3000GT&year=1991&catalogid=1&displayCatalogid=0