+1
Take your time and don't over torque putting them back on. The flanges won't move (gasket compression remains) if you put on one cover at a time and tighten. Pull all the nuts on your exhaust and you may have a fun time on the steep end of the learning curve. Enjoy.
Yup they arn't a Triumph part..
Oh one other thing on fitting.. ( thought AtomSplitter might include this in a story.... don't do it when the engine's just been running.....)