What is the difference?

[steplift20]

Thanks destroyer, I was thinking that maybe it’s because of the item is in a kit form but I seen another one one eBay and the last number was A6. But it does say it’s for my engine. Voltage regulator. They are discontinued for my engine. You can’t get it. Very hard to get one. But I got one. Just wondering,if you can’t get it what are you supposed to do? Get rid of the engine? That’s what they want. I love m6 2 stroke mercury.