Somebody is making a metal head for the 37. Here it is as an entire assembly....
http://cgi.ebay.com/RTF-ALL-Aluminum...QQcmdZViewItem
I emailed the vendor to see if I can get just the head, I'll let you know.
Soneebee didn't indicate that this head was exactly the same as his DF60 head, but seems to be more like the Align.
-Mark