No locking nut is required when mounting with the (MB) clamping flange. The clamping flange is very compact. Fine adjustment before clamping is possible. For the pistons with SC225M to SC2650M piston tube and for the MC5M, MC9M, MC30M, MC25M and MA30M types, the mounting block MB version SC2 must be used. Since the clamping slot is omitted here, the damper must be countered with the supplied locknut. 2 cylinder head bolts DIN 912 (10.9 quality) are included. With its extensive range of products and accessories, ACE offers tailor-made solutions for virtually any application. Our expert consultants will be happy to help you to configure the accessories and assist with the design.