I just used my propane bottle filler adapter to check the fit on the
internal threads of the standard fill adapter on a westy tank. (not the
autostop)

See pic

http://westydriver.com/Temp/propaneconnect.jpg

My westy tank is not mounted or able to be mounted to the van.  Can someone
check the angle to the westy fill port to see if a 14 oz or a 16oz bottle
would fit if connected this way?

I tested this just as you see it in the pic with a propane bottle attached
and the valve popped right open to take a fill (in this case blow propane
into the air).  Or possibly just put the bottle on there and leave it but
REMEMBER to REMOVE it before leaving.

Jimt