Hi Grant
The version you found
http://www.leevalley.com/en/wood/pag...=1,43456,50700 is the one I wanted show, I've had mine for more than forty years going back to teaching sailing as a teen great for sail repair and preventive restiching. Mine came from L.L.BEAN but they don't list it anymore. Also good for repairing boots.
The needles that come with it are a little large for seat covers, but stop in at a sewing shop that you can find needles meant for commercial sewing machine with thinner needle shafts but thick shanks. Buy them in boxes of 5 because they will break.
Cheers Phil