Amazon.com : 14 PCS Square Filter Kit Graduated ND Filters Color Lens Filter Set for Cokin P Series with Adapter Rings(49-82mm) Filter Holder Lens Cleaning Pen and Other Accessories for DSLR Cameras :
Adapter Rings for P-Series Filter Holders – Cokin Filters
Adapter Ring f/ 100mm Filters - Compatible w/ Fotodiox 100mm & Cokin Z-Pro Filter Holder – Fotodiox, Inc. USA
Cokin Adapter Rings for the L (Z) Series Filter Holder – Cokin Filters
Adapter Ring f/ 100mm Filters - Compatible w/ Fotodiox 100mm & Cokin Z-Pro Filter Holder – Fotodiox, Inc. USA
Cokin P482 P-Series 82mm Adapter Ring MPN: CP482 | eBay
Cokin Z-Pro Series Filter Holder Adapter Ring (82mm) CZ482 B&H
Amazon.com: FOTGA 82mm Lens Adapter Ring for Cokin P Series Filter : Electronics
Cokin Z472 Adapter ring 72mm for Z series - Foto Erhardt
Cokin Adapter Rings for X-pro Series Filter Holders – Cokin Filters
Amazon.com : Cokin 82mm Adaptor Ring for L (Z) Series Filter Holder : Electronics
Zomei 100mm Cokin Z Square Filter Holder+82mm Adapter Ring For DSLRCamera Lens | eBay
Amazon.com : Cokin 82mm Adaptor Ring for L (Z) Series Filter Holder : Electronics