An idea came to me today. I'm curious, is there any chance that the reason 53/10 wire is no longer available is due to it being used exclusively for the 408 pickups? I suppose the real question is do they use the same wire? The reason I ask is that awhile back I was able to compare my PS Bahama Mama #1 with 53/10 pickups to a Sig Ltd that I owned for a short while. I really could not tell a difference between them in Humbucker mode. The similarity was amazing. I was able to hear a difference in single coil mode, with my ears much preferring the single coil mode of the 53/10's. I'm doubting that the answer is this simple, but I thought I'd ask. Whatever the reason is for the lack of wire for 53/10 pickups, I hope they become available again someday.