I have one (LEB slant head) and it's been great. I'd recommend NGK B5HS, or B6HS. If you're using the stock plug boot, you'll have to unscrew the nipple on the tip of your new plug to get to make it work. You might want to upgrade the boot and wire. Either way, you can use the NGK plug. I'm sure there are others, but I've only used these..