Here's the breakdown

1992 - 1993: The 2nd generation platform gives rise to the GSR model. Fitted with a B17A, these are rare and highly prized models. Available as 2-dr coupe only.

1994-2001: The 3rd gen platform (with round, projector-style headlamps) continues the GSR model, but with an increase in displacement to just under 1.8L, hence the B18C1 motor code. Available in 2dr coupe (DC2) and in 4dr sedan (DB8) models, they make up the bulk of the Integra GSRs availiable in the used market today.

After 2001: The Integra nameplate is dropped in favor of the RSX (boo.). A new chassis is also adopted, with the double-wishbone front suspension of the 3rd gen being dropped in favor of a less-sophisticated MacPherson strut front end (boo.) The B-series motors are also laid to rest, replaced by the K20A and K20A2. The sedan variant is not carried over to the RSX platfrom -- they're available as 2dr Coupes only.

There ya have it.