For removal there are two plugs in your tail, one for each side.
I believe you'll need to pull the tail off to get to them.
If I remember correctly they are all bunched together on the left side,
one black, one gray, both two wire.
The rear turn signals come off very easy by unscrewing & the plugs pull through the hole.
Installation of the new ones may require some cutting of wires!
Good luck! Post a pic when you're done.
Deb
PS: I have an '06 so presumably this would be accurate for most 1st gen.