The way this goes is this: If you are able to refurbish an iPhone LCD as a DIY project (which requires highly specialized equipment and training), then you will already know how to source the glass.
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When regular people post this question, it is just because they are unaware the LCD refurbishing is not a DIY project. Buy a new “Screen” which will itself be a refurbished OEM lcd that a professional refurbisher has produced, OR it will be an inexpensive aftermarket LCD. If retaining the original LCD is important to you, then you can sell your screen to a refurbisher and buy an OEM refurbished screen. I do not believe that iFixit sells OEM refurbs (it is hard to do this in bulk) but call customer service to check. I am pretty sure that all the iFixit screens are good quality aftermarkets.