Rear Glass Panel replacement for regular Google Pixel, model G-2PW4100

I was wondering if anyone else had this problem:

I ordered the Rear Glass Panel replacement from iFixit for a first generation Google Pixel (not XL), model G-2PW4100. This one

Google Pixel XL Rear Glass Panel

But the one they've sent me doesn't fit! It's larger, like it's meant for Pixel XL. Customer service was super helpful and tried to send me a replacement, but it seems to be identical.

Anyone else have this happen to them? I'm not an idiot when it comes to these sorts of things, but I feel like I"m taking crazy pills!