Unsure if this is the paint part number BTR0171

If yours is a defender 110 then thats a rare machine .. there were only 500 in the country. ..
here is some good info on identifying all land rovers
http://www.roverparts.com/How_to_Identify_Rover.cfm

this is info on your defender
http://www.roverparts.com/Model/Defender110.cfm

under ..body parts.. they show lots of stuff for land rovers but little for your model since its so rare.
they claim they have a full line of parts for the defender so maybe a call to them might hit pay dirt

some interesting stuff about the defender here including some colors ..
http://en.wikipedia.org/wiki/Land_Rover_Defender#Special_editions

here is some paint colors for 93 land rovers
http://www.automotivetouchup.com/choosecolor/choosecolor.aspx?year=1993&make=Land+Rover&model=All+Models

this gives the color as alpine white and gives instructions on how to find paint codes
http://www.roverparts.com/Parts/PPNUC.cfm

maybe too much information but everything about that machine is so interesting .. and it still has high value .. maybe a classic

1993 land rover defender specs
http://www.parkcity4x4classics.com/index.php/specs/defender

a forum on the defender
http://forum.landrovernet.com/forumdisplay.php/69-Land-Rover-Defender/page3?order=desc