M_Boats: Shroud for M15

Hello all, Where do you get new shrouds for your M15? My old ones are showing signs of wear/rust and a couple strands of wire are already broken. I saw that Jerry Montgomery sell them on his website: http://www.jerrymontgomery.com/ but so far hasn't gotten a response. If I order from westmarine on my own should I get the 316 stainless or the 304 stainless? Some website says that the 316 is more corrosion proof. Does anyone have the 'official' specs of the M15 standing rigging? Thanks! Regards, Donglai