44694-4011 Perkins Heat Exchanger aka 38411-4011 Originally manufactured by Serck. This is a functional replacement. This is for the 4.236 Engine and is a side mount replacement.  This part requires you to take pictures of your current configuration and send to us to confirm whether or not it will fit.   This may take a bit.    We will then build the unit for you.  This is the reason it takes 14 days to ship.   It often requires a bit of work to make it fit once received so it’s best to have a skilled mechanic involved.   This part is not returnable.