Xbox One Elite Controller Bumper button broken - part needed

[nigelpugh7]

Hi everyone, does anyone know where to get one of the above, it's the silver coloured plastic buttons for R Button/L Button.

I don't mind replacing it myself, but can only seem to find them online from us vendors, and would prefer the original MS part.

Anyone else had the same issue that could help please, and let me know where you got the part from.

Thanks in advance.