Raybestos MC390156, Mitsubishi MB699830
1997-2003 Montero Sport, 1992-2000 Montero - non-ABS/ABS
15/16" Bore

Bore OD - 1.37"
Piston depth - .9614"
Bolt width - 3.1465"
Bolt hole dia. - .36"
Piston 'snout' length - .6155"
Fittings - M10x1


Raybestos MC39983, Mitsubishi MB699681
1991-1999 3000GT VR4, Spyder, SL - w/ABS
1 1/16" Bore

Bore OD - 1.375"
Piston depth - .9244"
Bolt width - 3.151"
Bolt hole dia. - .353"
Piston 'snout' length - .5930"
Fittings - M10x1

The piston depth is not entirely accurate. I measured it with a flat ended depth gauge and the inside of the cup is slightly rounded so I expect this is off by a couple 1/1000s. I did measure everything with the same tool, the same way, though.

By my measurements, there's only a 0.0145" difference between the Sport and GT cup depths measured from the mounting flange. Little enough that the push-rod can be adjusted if necessary.

Nothing else was off by more than manufacturing tolerances.

Oh, I didn't bother posting the 1" specs because I already know that the 1" and 1 1/16" are interchangeable. Figured that would be a little redundant.

Edward