Originally Posted by chewy
I personally think he's having your eyes out.
Yeh, me too. If nothing else, your Scottishness should prevent you paying that sort of money.
You do not need to use stainless bolts and I've never used them but I do use stainless nyloc nuts and washers. Normal M12 high tensile bolts will do the job fine, be stronger than the stainless super-duper bolts and they'll be a couple of kwid each if you're unlucky.
Be sure to seal the bolts into the transom, put a dab of grease on the thread before the nut is fitted and saw off any excess thread protruding from the nut. It you feel you'd like the extra security, put a normal nut onto the thread and then follow it up with the nyloc one as a locknut. Use thick washers to prevent crushing the transom.