The big connectors are molex 1.56" pitch KK series. For the male circuit board pins the CH3.96-XA series is good replacement. Change the X to the pin count.
https://lcsc.com/product-detail/Wire-To-Board-Wire-To-Wire-Connector_BOOMELE-Boom-Precision-Elec-CH3-96-9A_C10586.html
Or molex makes cut to size version, bit more expensive, but one part number.
https://www.tti.com/content/ttiinc/en/apps/part-detail.html?partsNumber=26-48-1245&mfgShortname=MOL&customerPartNumber=&minQty=3&customerId=
The female side of the big plugs use "trifurcon" 1.56" crimps.
https://www.tti.com/content/ttiinc/en/apps/part-detail.html?partsNumber=08-52-0113&mfgShortname=MOL&customerPartNumber=&minQty=100&customerId=
If the originals are IDC type connectors, get a new housing at the same time. These are fine
https://lcsc.com/product-detail/Rectangular-Connectors-Housings_BOOMELE-Boom-Precision-Elec-CH3-96-9Y_C10581.html
The dual row connectors are standard 0.1" - 2.54mm dual row ribbon cables. You can buy a new ribbon cable set on ebay. If you want to build your own ribbon cables the parts are all available for cheap. I found the crimper and cheap spools of ribbon on Amazon. Get the connector bits from LCSC or ive seen them cheap on aliexpress, example.
https://www.aliexpress.us/item/2251832563531097.html?spm=a2g0o.order_list.0.0.11251802YpcgzX&gatewayAdapt=glo2usa&_randl_shipto=US
The headers comes in strips of 2x40. searching for "2.54MM 2x40p header" will find them on aliexpress or they are cheap on LCSC. I am not sure if there is enough space for "boxed" ribbon headers which stop you from plugging the ribbon in wrong way.
