Q: you want master files wherein the lower-mids/bass/sub is all mixed center channel. It's a limitation of the format, otherwise the needle will skid off track or distort the music.  This should be in a 24-bit 48k or higher, even if the original masters were 16-bit 42k. If the factory only accepts audio cd masters, run the fuck away.  Seriously, even pre-orders would get you, personally, through the next year.  Or, you can do cassette ie Can I Borrow A Feeling?
A: reading back over your question again, i'm thinking you might have no idea who i am, but that's ok