Fox 2.5 ext reservoir

Hey all,

I couldn’t find anything online so I created this account to ask this question. I’ve been searching for a lift for my 2nd gen for a while and saw on Facebook someone selling a rebuilt set of fox 2.5 coilovers w/ the ext res. They haven’t been installed since the rebuild and I was curious how long the lifespan of these coilovers is, as I don’t want to spend a grand on a lift I’m only gonna get another 15-20k miles from. My other question is what would be a good deal if any for them. I did ask the seller and he mentioned they had about 35k miles on them before the rebuild. Any help is appreciated!