I have a '48 Jeep CJ2a I am working on.Everyoner I talk to says it is supposed to have a single piston master cylinder under the floorpan.Not mine.Mine is a double piston mounted on the firewall.It has not been altered.There is no evidence of welding or fabrication of any kind.What do I have? And more important,what re-build kit do I need? Any help would be greatly appreciated!!