Replacing o rings 8B4967

Replacing fuel pump housing o rings on 3T D7 #20616. Found fuel in oil.  Appreciate the previous info I’ve gleaned off here per this job, knowing what the old ring would look like etc.  Mine as shown is completely distorted similar to a pic from CCJersey.. I can easily enough exchange the tower side ring as it’s obvious located by sight. I don’t see second o ring. Manual serial #’s 3T2000 to 25309 shows it’s just above the bar assembly opposite end. My pic isn’t showing it there.  [attachment=67066]FE81B715-BD49-49E5-B605-384432DD5058.jpeg[/attachment][attachment=67067]907F118D-9683-4BA8-9931-7BE8F20B8CAE.jpeg[/attachment][attachment=67068]ADC89AA0-13D3-47B1-9C4E-952F25DF3A25.jpeg[/attachment][attachment=67069]FE96C883-E2AB-49BF-81D9-CEC2774C764F.jpeg[/attachment] [attachment=67066]FE81B715-BD49-49E5-B605-384432DD5058.jpeg[/attachment][attachment=67067]907F118D-9683-4BA8-9931-7BE8F20B8CAE.jpeg[/attachment][attachment=67068]ADC89AA0-13D3-47B1-9C4E-952F25DF3A25.jpeg[/attachment][attachment=67069]FE96C883-E2AB-49BF-81D9-CEC2774C764F.jpeg[/attachment]

Hi Johnny,
In your last photo there is a clamp that is holding plug 9b1332 in that is where the second seal goes.

 [attachment=67070]c1f0247d0bf0065ae11a91ec07ffa1d7[/attachment]

Regards

Many thanks Rax200 for the very good response.. also again to everyone who is willing to share their experience n knowledge keeping the old Cats running. Fine folk live here for sure.