I wonder how many people don't know the importance of venting fumes from the engine compartment. When you buy these boats new and you have the manual it stresses the importance of the blower but as the boats get resold the information isn't shared so much. People don't realize the value of owners manuals for the uninformed.
I don't see any part number for that spring. Probably a couple of ty-wraps across the bottom might hold it in position. The set up I have the blower is loosely sitting in the tube but it isn't coming out with the spring in there. I ordered the same blower. A high amp more powerful blower isn't need and why drain the batteries unnecessarily. This blower is 200CFM so that's good.
I did see that OSD sells a replacement but they say you need a 10 amp fuse. I'm not one for changing fuses without upgrading wiring and such. Basically, we shouldn't have fuel leaks anyway. Good Luck !