That's right, a wide pivot set to be used with the 73mm Wishbone from the B6 series. 

This increases the pivot width +5mm each side (10mm total) and MUST be used in conjunction with the AE #91853 or #91873 73mm Rear Suspension arms.

When used in conjunction with AE #91853 or #91873 73mm Rear Suspension arms this retains the original kit B7 position of the OUTSIDE (Hub) Hinge Pin.
This leaves the track width unchanged but gives the short arm, wide pivot setup. 

This product includes both C and D Blocks and must be used as a pair.

Both items follow design trends from our proven standard geometry parts. D block remains in our full brace fashion which has been highly popular for ultimate reliability.