That's a shame! Perhaps one of these are an option? They lack an option to cut to size but have a 350mm option
1.36US $ |2020R aluminium profiel europese standaard 2020 halve cirkel wit lengte 350mm industriële werkbank 1 pcs|3D Printer Onderdelen & Accessoires| - AliExpress
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3.05US $ 13% OFF|1 st 2020R 6 EU Aluminium Profiel 100 800mm Lengte 1/4 Gebogen Lineaire Rail voor DIY 3D Printer CNC|Hoeksteunen| - AliExpress
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0.8US $ |2 Stuks Aluminium Profiel Europese Standaard 2020r Industriële Aluminium Profiel Aluminium 2020 Legering Profiel Aluminium 6063 T5| | - AliExpress
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