I know Briggs still makes the L head in the quantum engine they put on some push mowers and the 550 series engines are L heads that are used on the MTD brand push mowers and some 2200 psi powerwashers. I just bought a Snapper consumer model self propel this past year just because the L head engines are getting phased out. But Briggs is the only one I know of.------Also, before I forget; I have a Toro dealer that I have bought from in the past that will sit on inventory from year to year because he can't move it. As a result, he has self propel mowers that he is still trying to sell that are from the model year 1998. So if you are going to buy a mower from another year, I would try to find out how old it is, I know that even though a mower is an older mower but is still new it will carry a new warranty with it, but who wants a self propel or any other mower that is supposedly "brand new" that is actually ten years or so old. Hopefully the guy I know that owns the shop is the only one with this old of mowers still trying to sell them as a new unit.