I'd use the old stand by for tying any width type dealy...The hook gape....is always a good general guide for width...

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"I've often wondered why it is that so many anglers spend so much money on,and pay so much attention to.the details on the wrong end of the fly line.If they took as much care in selecting or tying their flies as they did in the selection of the reel and rod,They might be able to gain the real extra edge that makes it possible to fool a fish that has,in fact,seen it all before" A.K.Best

"Wish ya great fishing"

Bill