You have the same setup as me. All the cradle will give you is somewhere to put your phone with the added bonus of charging it, and if you have a sharkfin aerial on the roof, improved reception. You'll still have to use your phone to access your contacts as this functionality is only available with a multiple function steering wheel, hope this helps
Oh yeah, this cradle will clip on to the unit attached to the dash, there shouldn't be any need to remove screws.