replacing Bosch dhg601duc with a dhg602duc downdraft fan motor

replacing Bosch dhg601duc with a dhg602duc.
the Bosch dhg601duc is a piece of s*#t. didn't last 5 years. motor started rattling like a chainsaw. can't find replacement motor.
tried to get a Brian Downdraft but a "standard" 30 inch opening is larger on a Bosch. so, stuck with cruddy Bosch.