I have a brand new 181/210 for a 12v in my garage that is the latest version with a bolt on retainer sitting in my garage. I was just in Saginaw all weekend drinking beer with a buddy too. If you can't find one let me know and we can work something out.
Hmmmm, I'm now noticing that. It may work though, I thought the only difference was the LP lobe. Hopefully a vendor can get him squared away I just know these things are back ordered like crazy so I figured I would offer up some help.
the 12v and the CR both have the lift pump lobe and are interchangeable.
Colt Cams version is 181/210 .279"/.307" 107LSA
Hamilton is 181/210 .290"/.320" 106.5LSA
Here are the pics I sent Zach and he said it is the latest. I also have a colt retainer and bolt for it. Give me a call if the vendors are all sold out. I was gonna put it in next week but I am in no hurry. 910-330-twonine13