This is the part number for the gates water pump I purchased that came with the correct o ring for the montero 43551.
This is the oem mitsubishi part number for the o ring itself MD030763
A complete gasket kit would be the way to go if you need valve cover gaskets, upper and lower intake comes off for that too.
Id suggest putting your new timing belt on before you start taking things apart too much and do a compression test on all cylinders.


1990 LWB RS A/T
1990 LWB Base A/T
1991 LWB LS A/T Going...Going...