Need advice on this lens hood EW-73

[therat]

Hi ,

Someone is selling this lens hood EW-73 on ebay.
The seller does not have which lens it fill in.
And I never encounter a lens hood is EW-73 only.
Can help me to see..
What is the different between EW-73 and EW-73II.
I'm looking for EW-73II for my 24-85mm lens.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=78999&item=7526314888&rd=1

Thks!