You talking the underlay under the glass? Phoenix arcade makes a silk screened one, that is a dead ringer for the original....not cheap, but the best quality you will find....
VicShaf sell Ms Pac underlays, but I'm not sure about Pacs??
www.pac-man.com. I know, I know... I've seen them and felt them with my own eyes and they're amazing, the best quality out there IMO and quite accurate.