And what if the part numbers change? Who is going to maintain that list? It's a lot easier to just say "35v 220µF" and suggest a list of commonly available retailers aka Mouser, Jameco, Digikey

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I was thinking there could be a section that explains what attributes to look for when selecting parts to ensure you are ordering the right components. Listing part numbers from reputable manufacturers instead of links to parts in online catalogs may also be easier to maintain. Attaching the data sheets may also help if parts become obsolete to find their current equivalents.