fuel filter question

[Hoobie]

I have a mx5100 with 1700 hours and 10 years old. I change the fuel filter annually. It sits inside a clear plastic cup with a spring that pushes the filter up against an o ring on a pipe that feeds fuel to the engine. Small ring about an inch or so. I was going to replace this ring but it is a pain to get at. And maybe it doesn't matter anyway.
Does anybody replace these? I suspect many Kubota models have the same apparatus.

 

[Devildog 1]

I have the same on my L 3540 when I went to the dealer to buy a couple fuel filters. They asked me if I wanted the big O-ring for the filter seat and the small O-ring for that pipe you’re talking about. I got both didn’t use both didn’t need to. I guess it’s better to have in case you lose them right

 

[RjCorazza]

I never replaced that o ring on my previous L3410, probably not the larger one either. They always looked good and fit well.