Page here says it all https://forum.il2sturmovik.com/topic/60671-mod-4k-cockpits-for-bosbombokbobp-planes/ Basically the cockpit resolutions have been doubled, those that are 1k to 2k, those that are 2k to 4k. The U2VS is already 4k so isn't included.
I have created this zip file in which there is a folder I created called "Oyster_KAI HiRes Cockpits 21Apr20". Inside that is the "data" folder and the folder structure for use with JSGME. Unzip and place the "Oyster_KAI HiRes Cockpits 21Apr20" in your Mods folder and enable it as usual. There are common files with the "polished canopies" mod so it will ask if you want to proceed, just say yes, the polished canopies mod will appear "greyed out". The "....21Apr20" part of the folder name is the day I created it.
It is 1.64 KB when zipped, 2.51 GB unzipped. I will try to keep it updated.