Yes,,, and unfortunatly I think you should use the correct fluid.. you are correct that my question implied that the wrong fluid might have caused the seal to leak..... I also think it wrong they require the special fluid...
That sounds like a very small leak... but I would keep my eyes open for a good one at junk yard or on Ebay... at the very least it gives you one to send out for rebuilding... or to try replacing the seal yourself without disabling your ride....