I am thinking I got the Master Cyl off eBay. I know what I installed looks a lot like this part (ebay part number 371855156204) but I don't recall the reference to Harley Davidson but that is what the part I got looks like. I recall that they mentioned the bold spacing and that made me pick it.

Keep in mind that I was disappointed with the stroke of my system and I wish the master had just a bit more volume than the part I purchased so maybe I got it wrong. If you find something you think is a real winner, please post a reply with the info.