If you pull your head unit and take a pic of the plugs on the back, I might be able to answer that. I realize you have a Disco, but in the FL with the H/K option, it's a plug-in upgrade to the NAV head unit and the Disco may be the same. I had to tap the VSS and reverse lamp circuits under the dash, no biggie. My DII has the same head unit that my FL had, so I ordered another HK Nav unit to plug in that one. The Visteon (single CD head unit) that is common in LR's has the same plug arrangement as Blaupunkt and Blaupunkt also plugs in the stock plugs... at least it has on mine. YMMV...