personally i wouldn't spend my money on them. total you're looking at $13. For $7 more you can grab a dunlop fasel or what i would do is contact joe gagan. here's his
ebay store. i trust the man with anything wah more that i can say. he'll custom wind one for you, and it will cost you like $20. not only is his stuff amazing, he's not expensive, will help you as much as you need, and he's a big member of the DIY community. in every wah i've build and will build i will only used his inductors and pots. he's wound special ones for me before at no extra cost. there are some things not worth trying to save a couple of bucks over.