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I started a thread about a week or two ago asking the same question but got no responses.

I agree, the price of those seats is ridiculous for what you get. Yes, they are nice, but not $1500+ nice.

In searching around, I saw what seemed like a few options that should work. I saw some seats by Tempo (?) or maybe Tempress (?) and other manufacturers that could be adapted to the purpose. I also saw some nice low-slung, upholstered, folding chairs that might even be a better idea. No, they would not necessarily be hard-mounted in place, but they would be easily removable when you don't need them aboard.

Here are some ideas:

These could be mounted on the boarding "steps" (as done on the 190) with a swivel base:

http://www.ebay.com/itm/Wise-Promo-Fo...5731.m3795

http://www.ebay.com/itm/Marine-Heavy-...1625833220


These would sit on deck just ahead of the "steps", which is where the 170 oem seats are mounted anyway:

http://www.amazon.com/Wise-Folding-Ch...B000KOP68W


Or you could go really simple:

http://www.homedepot.com/p/Picnic-Tim...-_-thefind


Good luck -- the Montauk 170 looks like a fantastic platform for your family.