multifuel heater question

[m-35tom]

there was a multifuel heater that was only 20,000 btu. i think it was used as part of some artic kit. i need to locate the adaptor that goes from 5 1/2" to 4" if one exisits or else i am going to have to make one. anyone have one that has a part number on it??
thanks

 

[gimpyrobb]

Mine is roughly 6 and 3/8 down to 4. It has 7537537 stamped on it.

 

[m-35tom]

thanks, but i don't have 6 3/8, i have 5 1/2"

 

[gimpyrobb]

Guess I have a different one, sorry.