dilip, you need shotgun for shooting rivets. the kind which is used in plants no service stn has this so no need of RIVET. rivets comes in pack of five but you can get two as well. I know as i wasted my 135 rs on them. there are two bolts existing in the punto chasis the arm rest bracket fits beautifully on to this and just needs tightening of nuts. But the holes where the rivets shall be rivetted shall preferably be drilled thru and fixing shall be done using 10 number bolt of ~3 inches length. the nut tightening shall again be done from under the chasis. Cover this nut+bolt using some plastic emulsion to make them rust proof. Once bracket is fitted, place arm rest on bracket use three screws(stud type- do not forget to order them) to fasten securily the arm rest to bracket and cover front opening with ornament and for vent opening may be we cd see pics of kiran and decide.