rear arb is welded into the section of the rear beam.. additional arb's bolt on.
front stock arb is a taper arb, 23mm in the middle tapering to 20mm on the ends
neuspeed mk2 golf arb's with. rear needs little L shaped adaptor brackets
23mm front 25mm rear
25mm front 28mm rear
rear neuspeeds are 3 position adjustable
25/28 combo is the most popular