I hope you got to visit the far end of the arboretum and checked out some of the cool New Zealand and South American shrubs and trees. Theyve got a neat selection of stuff hidden in there if you know what to look for.
Steve ought to give you the tour and drag you over here if you can find the time.
Ill peak through a few books and see if I can come up with a part number to see if anyone has one locally, but I kinda doubt it.
Jeff