I've had pretty good luck with Academy/MRC and Italeri..their replacement part service is basically free of charge. All you have to have is the proof of purchase off the box top and/or a sales receipt. The only problem with them is that both Academy and Italeri are based overseas, so it can take a while to get the parts. Other than that, they're great!
But, I happen to have some leftover parts from this kit, so, I'll see if I have what you need and will get back to you.