you have to drill a hole for the socket to fit through the fairing, but they install flushly into the fairing. They look like they were made for the bike. Asiancycle.com used to be a site that sold color coded turn signals for the 88-07's, but they went out of business due to the bike not being in production after, you guessed it, 2007 lol.
However, these are the turn signals that they used to sell.
Here's a pic of it installed
you will need to replace the bulb, however, with an 1156 amber bulb. I replaced the bulbs with 1156 amber LED bulbs and they work really well. You do have to replace the stock flasher though, and it can be with any two-wire electronic flasher found at local autoparts stores.
Just to clarify a little more on the flasher, you really don't need to order one specifically made for the bike. You can, but it's not going to make a difference. This is pretty much what I have on mine:
Also a mounting tip: on the back of the OEM flasher, there's a rubber mounting piece that slips onto the flasher.
(Seen at the top in this picture):
When installing your new one, take that rubber piece off the old flasher and super glue it to the new one. That way, you can mount it in the same spot. It may make more sense when you're actually doing the installation.