Thank you for the info, but I need lay files, not the complete boards.
Due to the vintage 1967-1982 I doubt you will find Gerber files to suit.
The service manuals available at HiFi engine, have both schematics and above board layout with parts identification. The requirement to fit exactly to the 303 chassis requires Quad's circuit lay out to suit, but you could carefully follow the schematic, noting there are two editions, to arrive at alternate board dimension.
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