There are two conversion kits available from NeOmega: BAe Hawk T1, 100 & 200
C90 - BAE Hawk 200 (£18.50) is for the 1/72nd Airfix Hawk 100 kit and contains: Martin Baker MkX seat, panel, bathtub, HUD, control stick, new fuselages, pitot tubes, canopy, refueling probe & decals.
C75 - BAE Hawk 200 (£17.00) is for the 1/72nd Italeri Hawk 100 kit and contains: Martin Baker MkX seat, panel, bathtub, HUD, control stick, front fuselages, pitot tubes, canopy, refueling probe, & decals.
I have the C75 and it's a good quality item. I'll probably order the C90 also.