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i severed a cable that is glued to the backplate of the digitizer (it can be seen in the repair manual step 22 img), do you sell thet specific part? or do i have to buy the whole kit?

That could be the digitizer cable or the lcd cable. Is a little bit hard to find the cable only ussually they are sold with the digitizer or the Lcd. The cable is soldered not glued. For you would be more economically feasible to buy another screen assembly and replace the broken one. All this if you did not broke the connectors on the motherboard also

You must be referring to the front camera cable that has copper (Black cover) adhesive that goes with the front camera assembly ribbon cable and the back metal plate you install behind the screen. You can buy the replacement rear camera assembly here on iFixit, note that the black copper sticker is not needed for functionality of the front camera or screen. Here is a guide to replace the front camera: iPhone 5s Front Facing Camera and Sensor Cable Replacement Here is where to purchase the part from iFixit store: iPhone 5s/SE (1st Gen) Front Camera and Sensor Cable