The 704m's are the wheels as is the 437m's. I suggest first make clear what wheels you actually have...
The new wheels with 19x8.5" ET35 in the front & 19x9.5" ET43 in the back are perfect fit and do not need any spacers. Btw, they 0.5" wider front and 1" wider rear compared to 704m.
I can only suggest to follow alohasurftoad's suggestions - do not re-use the current RFT tires and get the new ones; PS4S is a great choice. Also the wider tires would be very beneficial for you - wider fronts decrease the understeer and improve the steering feel, while wider rears provide more traction/better torque transfer to road.
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