RCM CRT .5 battery tray still available?
 

I no longer see the CRT .5 battery tray listed in the drop down menu with all the other vehicle-specific trays. Are these out of production, or can I still buy one?

You can still buy one, but they are no longer listed in the drop down menu. :)

Should I just use the "RCM Custom Work" item? And if I remember right they are $20 or $25?

That would work - add 20 of the "RCM Custom" items to the cart for the tray(and remember to leave a note). :)