[OM] Parts numbers for Zuiko 28 lenses

[Pandionhalietius]

Once before I needed a front element from Olympus and after they sent me the 
wrong part, someone was kind enough on the list to get me the right part 
number and I called Olympus and it went smooth.
I am hoping for a repeat performance.
Looking for the part# of the front element Zuiko 28mmf2 and 24mm f2.

Any help greatly appreciated!

Thanks
John