Would this be the 'front main seal' or 'rear main seal'??? I have both of these original nissan OEM parts still in the OEM packaging. i bought them before I did my motorswap planning on changing them before I installed the motor as some preventative maintenence, but they had very recently been done in the motor, so I didn't bother. I'd prolly let them go for a lil' bit of coin if ya need them.