How much of a discount should i be looking for on 60" Z with the 29 kaw on it? It has 12 hours on it and dealer claims it was only used on small residential lawns. Also, the dealer wants 600 plus for the Michigan Suspension seat. I have found a plain michigan suspension seat online for 319, do all of these seats use standard bolt patterns? It appears to my untrained eye that lots of companies use the same suspension seat and color doesn't matter to me. Would it void my warranty to use a non hustler branded seat?