Could be either- the hole count is the same (those holes are where the metal bracket grabs the block tabs). The 340/360 mount tabs are in a slightly different locale from the 273/318 on the driver's side. I've got a set, but I am putting together a full-on swap kit that I have to use them with- '67-'72 V-8 K member (gusseted and 1 1/2" skid plate), V-8 center link, 3.55 S/G 8 3/4" BB rear, BB brake kit spindle & UCA w/12" rotors and calipers, and a '73-'76 trans mount. These are extra pieces I have and am putting them together to sell as a package on Craigslist by the end of the month, so I cant sell individual pieces. Try Schumacher if you can't find 'em up in your neck of the woods (I'm using a set of his "Poly-Lock" motor mounts on my 340/360 kit).