The Merc number for leads for your engine is 84-816608Q71, but any high quality silicone lead set will be adequate. Just be sure to get the right coil-distributor lead (automotive have a different boot on one end).
Ayuh,..... Generally speakin', automotive plug wire Kits just Won't work on a boat motor,...
The wires are too short, 'n All of 'em will have the Wrong ends on 'em....
Unless yer custom makin' 'em,... Buy the 1s that Fit...