Cluster size

So I was making a template from a spare cluster I have and I ran into something that threw me off. The template is for aftermarket gauges mounting into a stock bezel. So Im wondering if all the clusters are like this.

It seems that they taper from smaller to bigger from left to right. I measure about 3-3/4" on the Left and 4" on the right. I just figured that it would be symmetrical all the way around. Would someone be willing to take 2 measurements on theirs? One on the left side one on the right side.

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