New Arbors In Old Deck

[Roy 0]

? I am in the process of trying to put mower deck arbors from a newer deck (#1691218) into an older 42" deck (# unknown; came with my 7013S). Looking at the Arbor Replacement Kit #1685085 instructions I need the Adapter Rings (2 per arbor, 6 total) to properly locate the pulley heights and blades. The original pulleys are 3.5" dia. and the new pulleys are 4" diameter. Here are my questions: If I keep the 4" pulleys what is the belt length & number for the arbor drive? Or, if I change to the 3.5" pulleys what are the part numbers for the pulleys (2 side arbors and the center arbor? The instructions I have are for the center arbor. What is the number for the side arbor kit (so I can down-load it from Simplicity)? Thanks,