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2 questions! I need help

So I am creating a resource pack and I am trying to make it 1.8.9, how do I do that? Also I was trying to make my swords be short and it keeps putting the OG sword texture in the extra area where before there would’ve been a sword. I try to resize it to 13 by 13 and it makes it 16x16 again and puts 2 swords 1 with the OG texture. Help!

It must cut it on model editor