Lightly used universal thatching blade by Arnold, called the Power Rake. These are sold at Home Depot for $28 and extra lines are about $4.
Each side takes 3 plastic lines and I have 5 left in a box
I don’t have the “star” adapter for a specific brand of mower but this was used on my old Troy Bilt MTD mower.
Or, just use as a regular lawnmower blade. The blades are in excellent, sharp condition.