It says right in the link that they work with them. I would assume that if their arms didnt work well with the BellTechs, MMW wouldnt say so right in the product description, especially since they also make their own apparently.
"This is the MMW Budget front end kit for the GM 355 / Colorado / Canyon Trucks. This kit includes upper arms with ball joints, all poly bushings, sleeves, and brake line mount holes. The lower arms come with a lower bag mount, shock mount, and all poly bushings and sleeves needed to install. They are intended to use your stock lower ball joint, or drop lower ball joints from beltech, or our MMW drop lower ball joints."