Is this what I should be looking at?

99-00 Civic Si

B18C5 (Type-R)
B18C1: Bolt-in swap
Requires wiring harness modifications.
ECU adaptor needed
Re-use 99-00 Civic Si Rear mount

B16B (Civic-R) Bolt-in swap
Requires wiring harness modifications for LHD cars
ECU adaptors needed