Link to buy tail lights
Item Cost + Shipping: $324 or ₹17240
Custom duty: ₹541 (May be slightly higher for you)
Installation Charge + 2 bolts: ₹100 (May be slightly higher depending on mechanic's mood)
Total: 17240 + 541 + 100 = ₹17881
Here is a pic which shows reverse and fog lights in action after the mod.
My phone is not DSLR to capture low light image but it's the best I could get
Left is white for reverse and right is the red tinted bulb for fog.