Chrome door latch (OEM Toyota) set of four is going to cost you around 4000/- through a contact who sourced them for me from Thailand. They were packed in Toyota genuine packaging. Got them verified for authenticity and fitted for free at one of the 3S Toyota.
Option 1 (Plug n Play): OEM Toyota (Full Options Steering Controls + Horn Pad/Cover + Spiral Cable) = 26,000/-
Option 2 (Half Alteration): Full Steering Controls + Horn Pad/Cover + Connections in Existing Spiral Cable) = 16,000/-
Option 3 (Full Alteration): Full Steering Controls + Alteration in Existing Horn Cover and Existing Spiral Cable) = 12,500/-