3.1 Litre Oil Pump Shaft O-ring

HELLO TO ALL:

DO ANY OF YOU HAVE THE EXACT PART NUMBER FOR THE ABOVE? I ASK AS I WAS SOLD THE INCORRECT PART BY A DEALER. THIS IS NOT THE FIRST TIME THIS SORT OF THING HAS OCCURED WITH THIS ENTERPRISE.
SO I AM DONE WITH THEM AT THIS POINT. ANY GUIDANCE HERE WOULD BE GREATLY APPRECIATED. THANK YOU AND

REGARDS,
FISH96
P.S. ANY AFTERMARKET PART NUMBER WOULD BE FINE ALSO, i.e.VICTOR, FEL PRO, HELP, etc.

i would try napa online and see if you can find one that matches. good luck.

Is this it??
http://198.208.187.182/internet/PartImage.jsp?mfgname=ACDELCO&prodlinecd=1&acpartnbr=10477565

Looks like it, but how can a picture determine the proper size. why not match the old one up at a parts house. Also in the future post the year of the car.

Thank You All For The Assistance, 2002 Malibu 3.1 Litre Vin J.

At Least I Now Have A Part Number; Yes It Is Different Than The One I Was Given.

The O-rings I Have Seen At The Local Parts Store Do Not Appear To Be Made Of The Proper Material, Which I Believe Is Viton (hi-temp Resist. 400f.)

Regards,
Fish96

It is also recommended to use some rtv on the "o" ring for guaranteed sealing, as this is a problematic area.

Thanking You All Again For The Most Learned Assistance. I Have Planned To Place Fiber Gasket Fel Pro #70194 With A Slight Coating Of Rtv Silicone On The Block Sealing Surface Of The Shaft.
Regards,
Fish96