I don't work for Mark Solloway HRS i work for a company who has never advertised.so you guys probably wont know it which is best till i hand in my resignation.As the trade is so small and word gets around.
The gartrak pedal boxes have not changed in design just the quality of their finish and their welding.I'm sure the rally design box will work fine but there would always be a little doubt in the back of my mind.When purchasing anything I do not expect to have to "do a few mods" to get it working.
But what it ultimately boils down to is price.
As you probably know it is not a massive job to fit a 3 piece bulkhead strengthener and is highly recommended for competition use.