New style rebuild kit, the piston is integrated into the piston. New Style kit includes 2 x pistons with integrated seal, 2 x dust boots, the spring (399), and the Bleeder Valve (405) The new style updated kit has a better piston/seal design. Manufactured by FTE, this is the OEM for MBZ.
We are also offering the old style kit which includes: 2 x Pistons, 2 x Seals, 2 x Dust Boots, 1 x Bleeder. Old style kit is $30 cheaper.
Our preference is the new style kit, but both will work well. The key to a successful rebuild is to have a perfect bore cylinder, with no pitting. If you have pitting, do not waste the cost of the kit, just replace the cylinder.