yes, theyre all the same
The socket has 2 connections: power, ground (like all single filament bulbs)
Take the corner light's red wire, cut it and put a female spade connector on it, connect that to one of the sockets tabs.
With the other tab connect another female connector and tap that wire into the black wire for the corner (this is ground).
If you want to shell out for the harness, by all means, but this is cheaper and works just as well. I just suggest you wrap the socket/connectors with enough e- tape to keep water out.

(oh and I really suggest amber bulbs...they look great as city lights)