which shifter holder do you have ? the original for the G25/27 gearstick or the Pro version ?
If like me you have the G25 version then the only way is to drill an additional hole in the metal plate so you are able to get the second bolt in place, use a template of the holes under the stick to mark where the second hole needs to be drilled and will be perfect as below
I am pretty sure the Pro version comes with pre-drilled holes for the TH8A so can't imagine that being a problem ...