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install retractable built in rangehood

1) The current rangehood is 900mm retractable built in. Over 20 years old. I'm not sure if it is fixable. So first is to access this status. If fixable, --- price? 2) When out for another appliance purchase, came home with a 600mm retractable built in. Because the rangetop is 600 -- and I wasn' thinking. I am having a tough time finding a 900mm retractable that is affordable. Can the 600 work here / what do we need to do to make it work? 3) If 600 will work and agreeable, install.