With the AE small bores I tried using an o-ring for the lower seal and an x-ring for the upper seal. This because an x-ring hates dirt, so I used the o-ring a bit more as a scraper for the dirt and the x-ring could do the actual seal. But since switching to industrial quality o-rings I've never had any real issues with the AE small bores which I've used on my X-6 until switching to Yokomo.
But, yes I'll get a set of these once there released. Only if it's just to try.
http://www.teamassociated.com/parts/details/91495/ 