Have you scoured the internet for that seal set?
And as a PSA to anyone who keeps a bike as a spare...go ahead and buy a spare rebuild kit for your fork and shock (every time you service it, go ahead and get another set of seals for net time), and a derrailleur hanger, and maybe any other oddball part that may be specific to your bike model and has a high likelihood of failing in the future...particularly when that size configuration goes out of style (26" wheel stuff for example).
As an example, I've had my 2.75" carbon anthem since 2014. I hadn't replaced the rear suspension pivot bearings yet, and the bearing are readily available aftermarket, though there is one VERY specific bearing...but I can still get it. But I also wanted/needed to go ahead and replace the hardware for all the pivot locations (bolts, bushings, etc)...I'm fairly confident I won't be able to get that hardware if I need to do it again, so I held onto the originals just in case I break something (or round out the hex heads).
I also tried to get a replacement derrailleur hanger to keep around. I have the original, and a replacement for it, which was a skewer, but had upgraded the hanger and it's chipset to a 12mm rear axle...can't find the hanger and chipset for that anywhere. I stared at online pictures of Giant's other models for that year, and bought a set for a Trance. It has an extra lobe, and of course Giant put a different size retainer bolt in this one, but it fits into my frame and will get me out of the woods if I need to pull it out of my seat bag.
Another example, a buddy has a Specialized bike. Something happened to the "wishbone" that connects the shock to the seat stays...can't get one for that model/year from Specialized any more... start searching the forums for used bikes with cracked frames.
ETA: oh yeah...AND go to rockshox or Fox and download the manual for your fork and shock for that model year and save it on your computer. They have all the service information, including decent directions for servicing, exploded parts diagrams, and parts and tool lists (with their part numbers that you can plug into google to search). I have a digital folder for each of my bikes with all the information relating to that bike and in there, including the manufacturer's website add with parts list and geometry specs.