That is the model number for the mower deck but it is written like this 15-42RC02. The 02 are numbers. The 2
000633 serial makes it a 1992 model. You can download an operator manual fromhttps://lookup3.toro.com/request/request.cfm
Enter the 15-42RC02 model number and 2000633 serial.
The parts lists are herehttp://www.partstree.com/parts/
Type Toro in the 2nd box and the 15-42RC02 model number in the 3rd box.
There should be a decal on the rear fender pan under the seat with the tractor numbers on it. If not post all the numbers you can find on the engine data decal and will try to identify it that way. Can't go by the deck because it will fit the C-Series from 1974 up and the 300 and 400-Series up to 2007.