[Applying third party lashes to Lelutka Korina Bento Head]

I hope someone can point me in the right direction so I can use the prettier eyelashes than those that come with the head as standard.  If I alpha out the lashes, as soon as I try to apply lashes made for lelutka third parties ( tried 6 so far, they cant ALL be wrong!!)  it simply removes the alpha and the basic lelutka standard ones appear.

What am I doing wrong??

 

Thank you for any help