Well, I don't know if I need them or not but I just bought a set of new glow plugs for my 4d55 from the english ebay: www.ebay.co.uk for $7.50 per plug shipped to my door in az. I don't know if this is a good deal but it sure seems like it. I jumped on it and will figure out later if I actually need them. he has more too. his auction is a 'buy it now' auction. Here's the auction title: Mitsubishi L300 2.3D (4D55 & 4D56) Glow Plugs LGP129
let me know what you guys think
toby