Emission map for shoes?

Hi! In the end I decided to learn how to create emission maps for CAS items (thanks to BG and some other people <3), I spent the whole day doing a set with pulsing light and top and bottom turned out great, but shoes was a mess. I've tried to put a 1024x1024 map like top and bottom, but the light was compressed in half of the height, so I've tried with 1024x2048 (texture size) but it was more compressed than before. So I've tried to use a custom size (the one where shoes are usually mapped following the template): the result was a CAS preview with hot pink feet (my deisgn is nude exept for some thin lines that should light into cyan) and when I make my sim wear it the sim disappear (like the old Grimm Reaper when you change his clothes). At this point I've tried to put the 1024x2048 colored sim template (I can't find the link right know) but it was worst, I can't understand which light corrispond to the color. Does anyone know the size of the emission map for shoes and where I have to locate the texture into it or know a way in which I can find it by myself? I'm lost at this point