I've been looking at the possibility of using a harness which incorporates an inertia mechanism.
In the UK Securon do one as Part No 700 and on the Corbeau site which I think is US based there is also one similar which has a lockable retractor so
for track days you can have a fixed set-up but go for inertia operation on the road.
However when I look for Corbeau seatbelts in the UK I end up with Luke and the retracter version isn't shown.
All I am trying to do at present is sort out the mountings for my chassis since I need to weld these in before getting it painted.
Any help (or info on how you have installed inertia belts) would be very useful.
John.