I didn't think that the wheels at astroworld and magic mountain were made by Intamin. The information that I have seen give the design credit to another(can't remember who but not Intamin) and manufacturer as Garland Steel. Maybe Intamin marketed them? or mabe these wheels were another ride originally made by another concern but rights were purchased later by Intamin (ie Air Race plane rides at Six Flags Georgia and Texas were built after the Brady and Kaye Rides at Opryland, Worlds of Fun and Old Chicago).