The shift cable in my 1981 C30 needs to be replaced. It's the model with the controls mounted next to the floor (Aft Port cockpit). I ordered the replacement cable from Catalina Direct and what they sent me was the throttle cable. I phoned them & they said that's the current replacement part & it could be retrofitted to fit the throttle. Upon further inspection, I find this hard to believe. Should I send it back & look elsewhere?