Hood for 80-320

[wendy beard]

I know that there's a hood available for the 80-320 lens and its part 
number (38701) but I can't find anywhere stocking it. I don't want to be 
ordering it from Pentax as I need it before the end of August (I've had a 
replacement eyecup for the MZ-S on order since March!)
Anyone seen one of the real ones to give me the dimensions? Anyone with one 
of these lenses using a hood? If so which make?
tia

Wendy Beard,
Ottawa, Canada
http://www.beard-redfern.com