Here are some shots of a MOMO Nascar Carbon/Kevlar seat I installed in my 1995 Lotus Esprit S4s. I'm using generic steel side mounts from OG Racing (they're probably Sparco pieces) mounted to the stock slider. This is a full race seat and wouldn't be my first choice but I had it already and thought I'd see if I could get a little more legroom by using it.
Initially, I was able to install it just using the steel brackets with no modification but it was too upright and a little too high. Two new holes at the rear of the brackets have reclined the seat nicely but I still have trouble with my legs interfering with the steering wheel. A smaller steering wheel is next on the agenda. TIP: Removing the seat is easier with the roof panel removed.