If you want retro [Jimmy Savile] how's about this then [/Jimmy Savile]
I hope you've got deep pockets though
http://caraudiosecurity.com/shop/pro...s_id/5822.html
Alternatively you could find an original/period headunit but not have it wired in then have an amp in the boot or under a seat then have a 3.5mm plug with twin phonos so that you can plug an ipod to it.