I have in a 413t. U have to ask a dealer to order one for a seismic. mine cost me about $1200. I helped another guy, told him the same as I'm telling u, and he paid about $1400. But he was in another state, maybe more shipping. Just go ask ur dealer. Then negotiate the price. It's only an $900 factory upgrade. So u should be on the hook for shipping. I know of 3 others besides me that have done this upgrade.
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