Here's the last two I bought off EBay.---These are vintage, heavy duty, and some are army surplus.---Those that come with vehicles today as standard equipment, I would throw in the scrap pile.---Of course these came with a vehicle to, but were made back when they were actually making real tools.
I have five of these, and like
McFarmer said, you can use them to jack sideways with 2 ton pressure.---I got every one of mine off EBay.---It's the only place I have found them.---I don't actually need five but every time I found one on EBay for cheap, I bought it.---Can't never tell when I'll need to make a 4 point jacking on a small building or something.
Check the link.---This is the last two I bought.---
Scroll down to the bottom of the page to see the jacks.
http://www.ebay.com/itm/vintage-2-S...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
http://www.ebay.com/itm/Vintage-sci...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649