SILVIA 83-88 What about our wheel spacer:. Specifics Wheel Bolt Pattern: 4x114.3. Vehicle Bolt Pattern: 4x114.3. Thread Pitch: M12x1.25. Exhaust Head Pipe. Radiator Intercooler Hose Pipe. Truly Forged Aircraft Aluminum 6061T6 Alloy, tensile strength 300-310Mpa, yield strength 241-275Mpa,elongation 8-10% ,more better than normal 6061 forged spacer or casting 6061T6 spacer.