What are the bolt dimensions for the SBR20 linear rails, can they work with 8020 Aluminum extrusions?

Our SBR20 rails use M8 bolts and are suitable for use with 8020 aluminum or any other common machine material. We suggest the use of our ball bearing pillow blocks with these rails, which you can find on our website here: https://buildyourcnc.com/item/mechanical-rails-linear-ball-bearing-block Additional Information: HOW TO FIND WIDH 38 HEIGHT 26 LINER GUIDE RAIL