(request) model swap for paladin's mantle

[TheDanielMetal]

Hello, i need help i have tried for 4 hour to swap the paladin's mantle with the Wyrm Hunt Mantle (Because i love that cape so much)

but i always have a problem with the m_body_c000.dwm file, i don't know what to do, please if you can explain to me what to do or if you can give me the swapped .arc i'll be so thankful.

 

Please help.