Not to discount this option, but just please, please make sure if you buy a motor lock like the one pictured, it is either stainless steel, or crafted from aluminum. My outboard had one of these previously, just like the one pictured, and it was basically painted plain steel......or buy one of these to prevent the clamps from untwisting. Locks the clamps in the horizontal position and prevents thieves from stealing the motor too...
...you can see where this is going. The two halves were joined together from the rust formed between them. Great for keeping your motor on your hull, but if you ever want to remove it, get your tetanus shot, and be prepared for a long, heated battle in very, very tight quarters, with loads of rust flying all over the place. Needless to say, I run a simple safety chain now. That motor lock did not belong on a boat that is used in saltwater.