oh yeah and the gear stick and linkage

but you can use your current linkage stick gearbox mont and torque link if you swap your 1.6 ib5 for the 1.8 ib5.
170bhp will not break a ib5 hell 1000bhp wouldnt its torque that breaks gearboxs and the st170 doesnt make much more torque than a 1.8 so it would be fine under the power.