That speaker size is correct, yes (5x7 inches).
You do have to take the whole door card off, yes. Probably better to do that anyway so you can maybe stick some sound proofing on.
Good luck,
<font face="Verdana">-- T.
<font color="maroon">'98 Marea Weekend ELX (1.8 16v).</font id="maroon"></font id="Verdana">