The HFM BM57 Master Cylinder features a 17/16 inch (27mm) piston bore size and is suited to both ABS and Non-ABS setups. Perfect for if you intend to increase your braking performance and reduce that spongy pedal, giving a shorter, firmer pedal. Vehicle Compatibily Nissan S13 240sx Nissan S14 240sx Nissan Z32 300ZX The product is suited for LHD models specifically, however can be used on RHD when using the Gktech hard line delete kit or ABS delete kit. NOTE: If you have ABS you will need to block the middle port with the provided tapered grub screw.