6 x R = 6 mm spacer thickness, R = root opening dimension (mm)
(e.g.: D1.1:2000, TC-U5a Spacer dimensions are 6 mm by 10 mm if the groove angle is 30 degrees.)

Don't try this with your 2002, they screwed this up and the metric section has a fraction (inches) for this dimension. You have to do the conversions for your $300.

This will probably require the AWS to raise the price again for this publication...