Omix proudly offers replacement brake components for your WillysJeep that meet or exceed OE standards for quality so maintaining optimum braking performance has never been so easy This replacement brake master cylinder fitting bolt fits 41 - 45 MB, 41 - 45 GPW, 45 - 49 CJ2A, 48 - 53 CJ3A, 53 - 67 CJ3B, 50 - 52 M38, 52 - 71 M38A1, 55 - 66 CJ5, 55 - 66 CJ6, 48 - 51 Jeepster models. The bolt is 1.25 in. in length and has in. by 20 male threads and 38 in. by24 female threads with a 34 in. hex head. Replaces OE part number 637605