Flathead timing covers???

[BUBBAS IGNITION]

Need some help here regarding flathead timing covers and distributor mount.
After shipping almost 600 of the Chevrolet conversion distributors and building a few hundred of the reg Ford distributors , i actually thought i had it figured out which was which.
I made up a flathead display table that i use for swap meets etc and used every kind of front cover i could research etc.

I have these in my swap meet truck and can if you wish supply a picture of each individual cover.

Now i have some questions???? And maybe a correction or two???

1=I thought the only aluminum cover was a Mercury cover with lower (below the gear) support... ( correct or not)

2=All others are cast iron ??? ( correct or not)

3=Only the Merc used the lower support ?? ( correct or not)

4=There are possibly five cast iron covers.

Early ( 4 hole bell distributor) , early (3 hole bell distributor), shallow ( 2 bolt crab) used with a early camshaft, and a deep ( 2 bolt crab) used with earlier camshaft, and the cast upright single hole distributor.

How does this sound ???

I will do a cover write up after some discussion and include pics.

Do i have them all.??????????

I did discuss with Bruce L. and he suggested putting up this post .What ya think......