Factory Five Racing Mk4 Roadster Assembly Manual page 143

Place a straight edge on the rotor wheel mounting surface on each side of the suspension and measure
across the car to find the suspension width.

With these axles, it is recommended that the rear suspension should measure 59.00" for the
standard width or 54.00" for the Pin drive/narrow width IRS.
If your measurement is different than above, find the difference between your axle and the correct
measurement then divide it by two. This is the amount each side of the suspension needs to move in or
out.

Standard axle : (Axle measurement – 59.00)/2 = difference to adjust suspension per side

Narrow axle : (Axle measurement – 54.00)/2 = difference to adjust suspension per side
Jack the frame up and move the jack stands to the frame.
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