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Mercury 500 Lower Unit/Gearcase replace

Hi, haven't posted in a while, and forgive me if this in the wrong place, couldn't find a similar question, but I have a Mercury 500 50HP Serial: 3350325

Looking for a lower unit to replace one that has a crack in it.

Charts say it takes a 6038A6, but I can only seem to find a 6038A7.

Are they interchangeable?

Thanks!

Leo
 
Those are series numbers for the lower unit you need. The 7 is just a bit later part number, You should make sure it is for a long shaft. (measure the drive shaft). I was bamfoozled for a time looking for one to use for the internal parts. Never found a direct replacement for a reasonable price but I found one that had all the parts I would ever need. The difference was about 1/2 inch of being a direct fit for the case. My 500 is in the 4900000 range.
 
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