The beam mounted RCGF 20 is pretty similar to the DLE 20, but not real sure how the muffler mounting bolt centers compare. Assuming they're pretty close. BP Hobbies is showing this header, but it's out of stock.
http://www.bphobbies.com/view.asp?id...9&pid=E2674925
They also show this one, which appears to be in stock?
http://www.bphobbies.com/view.asp?id...0&pid=E2674933
Might be worth a phone call?