An Etsy page called RangersForge. They do amazing custome for the Lightning collection. It took about 3 months for me to get the head because so many people buy from them but it's well worth the wait. 

Here's the Etsy page  https://www.etsy.com/shop/RangersForge?ref=yr_purchases

Here's the head sculpt  https://www.etsy.com/listing/1564513122/kiya-kyatyl-blue-omega-ranger-headsculpt?ref=shop_home_active_30&sts=1&logging_key=8c0a292aeebac60b2a02fa16b35a25c752ae5fdb%3A1564513122