i have purchased a td15c. I read somewhere to look on the rear right side of tractor to find the last 4 of the serial number. I found the number 1994 stamped in the frame. I believe that makes the machine a 1975 or 1976????. I want to order all of the clutch and brake disk and plates for this machine and do a rebuild on the brakes and steering clutchs and also the drive clutch. I have a 1985 parts manual but I'm afraid the 1976 and 1985 tractors might use different parts. I would approximate any help deciding which parts I need to order.