Please Help! Mounting Downriggiers on a Whaler?

I have a classic 13' boston whaler and just bought 2 used Penn downriggers. I am look ing for any ideas or ways to mount these downriggers to my boston whaler. Are there any ideas out there. Thanks for your help.

rail mount


Do a google image search and you will see some pics

I already have some downriggers I need to mount on my 17' Montauk. There is a rail mount bracket that can be purchased but is says for use only on welded rails mine are bolted together. I am thinking of having a custom made stainless steel bracket made. good luck.