Help w/ Old Ertl/Esci OH-58

Howdy boys and girls,
I inherited an old Esci release of the 1/48 OH-58, but it seems that it's missing only ONE part. Just my luck, it's missing the part that makes up the cabin roof/rotor assembly mount. Would anyone have info on how to get the part from Esci (I won't hold my breath)? Or does someone have that kit unbuilt? I'm sure I could make the part out of thick sheet stock if I had a tracing.
Thanks in advance,
-Omar

P.S. I DID post this on the whirly-bird forum, I'm just trying to get max coverage.