Woah. That's some uncanny bad luck.
I looked around for awhile to try and find replacements or see if I could find the measurements but I couldn't. It'd be possible to measure the o-ring size but I'm not entirely sure about the screws.. I think you may be SOL unless you find them, my advice would be to do a more thorough search. How'd you lose them in the first place? Start from the area where you were rebuilding and look in the most odd places. Carpet, under the chair, couch, every nook and cranny within the general vicinity.