Is there a chance that someone might know what kind of pump this is? I have a 51 8n and the pump is from a Dearborn 19-8. I found the pump for the 19-8 but it is a little different. As you can see from my pics the back is solid. And the original looks like it had a bolt or drain on the back. Sorry I don't have better pics but I thought I would be able to find something with all the numbers it has on it and only took close ups.