We have all of the parts you will need but we do not sell one big kit. You will want to make sure it has a manual transmission. The automatics can't be flat towed. I have listed everything below that you will need to flat tow your 2003 Toyota MR2 Spyder:
Tow Bar and Safety Chains - etrailer SD Non-Binding Tow Bar for Roadmaster Crossbar Base Plates item # e44ZR
Base Plate Kit - Roadmaster Crossbar-Style Base Plate Kit item # 1169-1
Wiring Harness - Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil... view full answer...