Aftermarket IWC bracelet doesn't fit my older Spitfire Chronograph!?

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I wanted to try a bracelet for my iw371702 and since it is an older model the original bracelet isn't available new anymore (at least I couldn't find one).

I therefore bought a non branded aftermarket one from China. These are typically for the petit prince but is

I was disappointed to see that it doesn't fit!

It appears the lug holes are too far forward and so whilst the end sections do fit flush when held in place, when using spring bars fitment is very off.