I have put all the measurements of the kit pickup, TRT1 and the hole in the bridge plate in the visual below.
Comparing the kit bridge plate with Gotoh and some other bridges on the market I found out they all use the same measurements. As you can see in the visual from Tonerider the measurement I took and those given by Tonerider match(+/-).
So the question becomes: If all the bridges are the same and tonerider makes their pickups in this slightly larger size, how do other people squeeze them through?
Again it is likely a matter of 1mm to clear, but I feel uncomfortable pushing one side of the coil harder up against the hole in the bridge plate, whilst trying to squeeze the other side through.
I could always ask tonerider if this is a familiar problem, or sand a bit from the bridge away, or a bit from the fibreboard.