CONTINUOUSWAVE

Q1: [Did Boston Whaler offer the option of a] stern bench seat with back rest for the 150 Montauk?



[Describe how a stern bench seat with back rest that was not OEM could be] added [to a 150 MONTAUK]

Q2: does Boston Whaler still make the port and starboard stern seats [for the 150 MONTAUK]?

There was no optional seat offered for the Montauk 150.

The Montauk was redesigned in 2018. Any option based on the prior version is no longer in production.

If you can find the parts list for the boat it will show any optional equipment. From that you should be able to check online for avilability of the parts needed to install the seats. I've seen obsolete parts for Boston Whalers for sale on EBay. Good luck.