This is a very high quality and very correct master cylinder. This is for the 49-66  Willys Jeeps. This will fit the CJ3A M38, M38A1, CJ3B and CJ5.  The holes measure  3 1/2" from center to center. This is foreign made but I have been using them for years and never had the first problem. Why pay a lot of extra money for just a name when this is made by the same company.    QTM Parts