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Lots of parts info in our Reference section at the top of this page.
http://www.whalercentral.com/viewpage...page_id=69

86qt was the original now replaced with the 94 qt mainly due to the larger domed lid.
http://www.whalercentral.com/photogal...hoto_id=39

Your HIN is missing some characters as all HIN numbers have 12 characters.
Look at the "Model Year Format" here:
http://www.whalercentral.com/articles...icle_id=61

Also see these other Montauk HIN and Stencil numbers to see where your boat fits.
http://www.whalercentral.com/articles...icle_id=17

Your HIN should be more like this:
BWCB5820M75K

and your Stencil should be in the 3B0100 range approximately.

Let us know more about what you find and Welcome Aboard WhalerCentral.