I don't have a mini-Digilink connector with me to measure, but I think they are this type of HDR series 0.8 mm pitch x 26 pin connector.
https://www.htk-jp.com/product/index...ntal&lang_cd=2
https://www.htk-jp.com/product/templ...HDR2009526.pdf
Surface mount, so likely HDR-EA26LFY series.
I suspect you may be more successful still waiting and buying a used HD Native Card and just using that. Especially since the discontinuation of HD Native cards is going to cause issues, you might also try reaching out to Avid support and begging them to supply a spare.