Ash pan replacements...

[Mmmmm]

Is there anywhere that I can order the twist style ash pans? Or do I just replace a missing B vent ash catcher with the current style?

[Harbormaster]

Not sure if you can order them.
To be period correct, the B would have the twist ash pan with the rolled edge. At least mine does.

[G]

I havent seen one and am pretty sure they quit selling them years ago.  Your best bet for a period correct style is to wait for a donor grill to show up on CL or put out a call for one on this site.  Otherwise, the current style will work but you will have to add the clips on the legs.