May I use a 339-832757a4 coil instead of a 336-4409a4 coil on a 1970 7.5 hp Mercury outboard? The coil I would like to use is newer and half the cost. The only obvious difference in appearance is the lack of the braided grounding wire that would ground to the mount through the coil cover. The newer one is apparently grounded to one of the terminals. If I had to, could I just clip the grounding strap and bend it up to ground it to the cover like on the old one? Or could I simply use it as is? Thanks for any help.