I am wanting to convert my 1980 20 hp 2 cyl Mercury outboard engine to remote controls. I will be using a Uflex dual cable side mount box with C-5 cables. I am aware that a remote attachment kit is available, but am unable to determine the part number for this attachment kit. Please advise. Thank you. PS The engine serial number is 570?368. I can't read the middle number, but research shows it as a 20 hp, 1980 issue.