Here are photos of both gauges. The narrower gauge is for the Narrow Frame, which has the springs with the bent tips (kit 759-3490).The wider gauge is for the Wide Frame with springs with flat tips (kit 759-3489). On the superimposed photo you can see how the Wide Frame gauge will cause the center wear button to be 3/32" higher, and thus less spring tension.
I've had problems with the flat tip springs on my Wide Frame, so I used the Narrow Frame kit with the proper gauge, and it has worked fine for years.
If you want a Wide Frame gauge I can mail you my extra gauge, just reimburse my postage.
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