Hello,
Many thanks for your email,
The hangers we use are as per the link below however they are not universal so they may not fit other manufacturers headrails, You can order one on the link to try first to see if compatible but our hangers do also come out of the slats with a wriggle if you want to use your existing hangers.
https://www.blindsbypost.co.uk/blind-parts/vertical-blind-accessories-parts/blind-hangers/89mm-deluxe-vertical-double-slotted-blind-hanger
https://www.blindsbypost.co.uk/blind-parts/vertical-blind-accessories-parts/blind-hangers/127mm-deluxe-vertical-double-slotted-blind-hanger
Kind regards
Sophie