Yeah those flasher relays are a pain to get out. I had to get a couple of small flathead screwdrivers and a couple of tiny trim removing tools to finally get mine out. There are actually 4 clips holding it together. Two hold the relay to the fuse panel and two that holds the relay body together. I confused the two for the other two.
As far as I know, the flasher relays are different between '87 and '92. I tried finding a LED ready flasher relay for my '87, but no one makes one cause the connector pins are in an odd configuration.