Fuel Pump O ring

I looked and did not find my answer. I replaced the original fuel tank on my 89 from one I had in a 96 parts car. Originally I was just going to swap the tank and the filler donut and call it a day but the SN95 hanger has different diameter tubes so I had to put the foxbody hanger in the tank. When I did that I used the old o ring. Fastforward 3 months. Now when I fill the tank, I smell gas. I think the o ring is leaking now.

Does anyone just sell the o Ring? I all I see are o-rings and the locking retainer. It comes in a kit. I do not need or want the locking retainer. I just want the o ring,. Any help would be appreciated. Thanks

thanks and sorry for the late reply. I have been under the weather lately. I am going to have to bite the bullet and get a pair of o-rings + locking rings soon as the fumes are getting stronger with every tank.