there was a prior thread on this but I did not remember all of the details that were posted. I'm thinking that a 1 piece pan gasket is available & 5.2/5.9/360 LA engines can all use the same oil pan but use the mag gasket with the 5.2/5.9 pan and an LA gasket with the 360 LA pan. EDIT Do check further to see if the 1 piece pan gasket is a better deal (I'm assuming that it is) but I vaguely remember some issue regarding that) but I cant swear to it. MORE EDIT to quell some confusion the 1 piece they are referring to is the pan gasket not the rear main seal which (it) needs the 2 halves to go on either side of the knurled journal.