Facelift DC5s (2004+) had the remote incorporated into the keys.
Pre facelift DC5s (e.g. DC5R) had separate remote and keys (AFAIK the remotes are interchangeable and can be programmed to suit).

You could just get a new remote and program it to suit the DC5R.
Its pretty easy to do as I've reprogrammed a remote from an 2001 ES1 Civic to work with a DC5R.
Otherwise you can modify a Euro/DC5S key or something for a DC5R? (Not sure how to do this though)