Nope. That's PN# 54021. In the images below, this would be the peach and baby blue parts.

This is the Montero/Montero Sport BMC.


The sensor float assembly is the peach colored rectangle.


This is the 3000GT VR4 BMC.


The sensor float assembly is the baby blue colored rectangle.


This is the 'cup' thing that sits inside. It just sits there loosely. It falls right out if you turn it upside down. There's space between it an the sensor float - the two are not connected.


This is the reservoir with the 'cup' installed. If you look closely at the slots around the outside edge, you'll see that their screened off from below.


Mystery part of the month.

I spent a bunch of time yesterday surfing. I can't find another image anywhere of this, or even an approximation in some other manufacturer's BMC. No explanations, not even a mention on any other forum. I've never seen anything like this in any other Mitsu BMC.

I checked and it doesn't appear to be in the 1" 3000GT BMC, either. Only the VR4 1 1/16" BMC.

The only purpose I can see for this is to prevent sucking air into the BMC and lines under very hard cornering conditions and/or to keep the sensor float from signaling low fluid level under the same conditions. Like I said above, its a loose fit so its not like those screens are going to keep any crud smaller than a BB out of the lower half of the bowl.

Edward