Pan head castings

I'm finding more variants than Palmer shows, including 2 different 1956.
What I have so far (appreciate any clear pics!!):
http://victorylibrary.com/tech/panhead-c.htm

Any more I should list?

Panic I know of 2 original late 1954's with the 1955 type D ring. Casting is the same as 1950 to 54. These bikes both have the straight leg frame. Jerry

Thanks.
Palmer also says that the FLH (ported) head is labor only, same casting - but I find more casting numbers in this series: 16704 and 16706-55, in which the ports appear to be "as machined" (obvious step below the valve seats) - should these be the FL heads?