I'm going through a B7100 also at this time and I was not impressed with the seat mount, it was going to beat me to death. I made a new bracket and use springs from at Wheel Horse garden tractor. Note: my seat had a good cover but the original foam was long gone so it was easy to bolt the seat pan to the springs. The seat suspension is very nice now with about 1-1/2" of travel. With this set up the seat sits about 1/4" higher unloaded then with the original mount.
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