When I bought my X I did not have the proper anchors for my rubber mats. I had the velcro type anchors under the rubber mats which did not do much for holding my mats.
I searched to see if I could find the proper anchors online but no luck.
I finally found E46 anchors advertised on ebay (from Turkey no less!) and ordered a package of 10 of them. I do not know if they are the same or similar to the proper anchors, but they worked fine. Waiting to see if they will really hold the mats now!
Pics attached.