Custom ppd for lazerjet printer works with linux only

[Stephen]

I have a custom ppd file for a lazer jet 1320.
All I have added is a custom paper size 5X8 index card.
The ppd works great for users from linux desktops and linux servers but when a OSX user tries to print (from neooffice) the papersize is not in there menu of options.
Here is the relevant section of the file:
*OpenGroup: General/General

*OpenUI *PageSize/Page Size: PickOne
*OrderDependency: 100 AnySetup *PageSize
*DefaultPageSize: Letter
*PageSize Letter/US Letter: "<</PageSize[612 792]/ImagingBBox null>>setpagedevice"
*PageSize A4/A4: "<</PageSize[595 842]/ImagingBBox null>>setpagedevice"
*PageSize 11x17/11x17: "<</PageSize[792 1224]/ImagingBBox null>>setpagedevice"
*PageSize A3/A3: "<</PageSize[842 1191]/ImagingBBox null>>setpagedevice"
*PageSize A5/A5: "<</PageSize[421 595]/ImagingBBox null>>setpagedevice"
*PageSize B5/B5 (JIS): "<</PageSize[516 729]/ImagingBBox null>>setpagedevice"
*PageSize Env10/Envelope #10: "<</PageSize[297 684]/ImagingBBox null>>setpagedevice"
*PageSize EnvC5/Envelope C5: "<</PageSize[459 649]/ImagingBBox null>>setpagedevice"
*PageSize EnvDL/Envelope DL: "<</PageSize[312 624]/ImagingBBox null>>setpagedevice"
*PageSize EnvISOB5/Envelope B5: "<</PageSize[499 709]/ImagingBBox null>>setpagedevice"
*PageSize EnvMonarch/Envelope Monarch: "<</PageSize[279 540]/ImagingBBox null>>setpagedevice"
*PageSize Executive/Executive: "<</PageSize[522 756]/ImagingBBox null>>setpagedevice"
*PageSize Legal/US Legal: "<</PageSize[612 1008]/ImagingBBox null>>setpagedevice"
*PageSize 5x8 Index Card: "<</PageSize[360 576]/ImagingBBox null>>setpagedevice"
*CloseUI: *PageSize

Any Ideas?