Older satellite mounts can work great for your Starlink system. We had to use one strip of sealing tape to take up the extra space with this one, this tape also holds Dishy in place. The Gen 2 system mount has a slightly smaller OD than Gen 1, making this install easy. Not all J-arms are the same size, although the majority are 1-3/4" OD, there is some variance. So make sure it works before completely installing.