Hi, I picked up a new Yamaha lower unit at an auction. I was told it's for a 1998 + 99 Yamaha C150TLR. Part # 6G5-45300-16-8D. I know the C means commercial. The last letter of the model # was not not given. This is a 7 bolt unit. Anybody know what years/models this will fit? There is a letter "H" stamped in the back of the housing in the location that an "L" is used for the Left-hand units. Any idea what "H" means?Maybe "hardedened" for shot peened gears? Thanks-a-lot for your help!Steve