6 point Impact Racing belts mounted OK in my 99. The outside lab and sub belts mount in where the factory belt goes with eye bolts and snap ins. The inside mounts required a plate with eye bolts- a little welding (but I didn't do it
).
The G-force black 6 points (~$70) were not in stock at the time so I went with ~$100 belts at Impact. At first I wasn't happy about the higher cost, but I like the construction and the yellow lightening bolt on black looks good. I did have to order longer straps for the subs to fit over the stock seat.