77mm Metal Adapter Ring +100mm Square Filter Holder Support For Haida Lee Hitech Cokin Z Pro 100x100mm 100x150mm Filters - Camera Filters - AliExpress
Cokin P Series Filter Holder Adapter Ring (49mm) New In Package | eBay
Adaptor rings
Amazon.com : SIOTI 100mm Square Z Series Aluminum Modular Filter Holder + 77mm-82mm Aluminum Adapter Ring for Lee Hitech Singh-Ray Cokin Z PRO 4X4 4x5 4X5.65 Filter(77mm) : Electronics
Cokin Cokin P Series Filter Holder and 67mm P Series BP40067K
COKIN P-SERIES 52MM ADAPTER
Zomei Filter Holder + 67mm/72mm/77mm/82mm/86mm Adapter Ring For Cokin Z Lee Tiffen Hitech Singh-ray 4x6" 100x100mm 100x150mm - Camera Filters - AliExpress