Hello Tntate - Oh, I see, I couldn't see the screw holes because they were under the rubber feet!
In my case, with 805N's, when I bought them they had some cheap, lightweight stands, and I was skeptical that stands would make much difference. I wasn't so impressed with the speakers at home, and was ready to dump them at one point, but then on a whim took them to a shop and put them on some very heavy stands made for them by TOAC, and it made such a difference I bought the stands kept the speakers longer. Eventually, I discovered that the 805's needed more power than I was giving them. I switched from a 50W/ch amp I had been using to a 150W/ch McIntosh amp, and found that the 805's are totally kicken' speakers when given some power! Eventually I found some original B&W stands for them, and with an amp powerful enough to run the 805's beter I could really hear improvement between the TAOC's, which are fine and good-looking third-party stands (and not cheap!), to the B&W stands, which were cheaper but designed together with the speakers. I had them on the stands with blue-tac for a while, then tried various types of feet and such, until I finally emailed B&W to find out the proper screw size, and later got all the original spikes and screws, and the sound became more refined and detailed.
The moral of this story is, in my case at least, after many attempts at cobbling and much time spent, in the end the original B&W parts sounded much better than anything I had tried. I'd therefore just try the original stuff first if I were you.
I found a manual for your speakers online easily, but it doesn't mention mounting on stands.
I'll dig through my old emails and see if I can find my communications with B&W regarding my stands here in Japan. If I can, I'll ask them about the screws/spikes for your speakers and post the result here for you. Might take a day or two...