What have others used i see lots on ebay none say if they fit with fins on tho ?
Only ever seen them for small portable outboards - not sure why you’d want one for a larger outboard - and I’d be wary - I’ve heard of outboards being fully wrapped up causing corrosion problems with the internals - better to let air circulate through the air intake I’d think.
Make sure it has a good vent then in line with the cowling vent, as the type you can get for when an outboard is running - they generally have a bit of netting over the vent, which would stop your leaves getting in. In fact would one of these covers do the job? - there's not much on the leg where leaves could settle.i live in the woods gotta keep sap and stuff off