Carrier 42mm Uniline brand Unitrack system 40mm track older style vintage track

Vertical blind Carrier suited to 40mm  x 40mm tracks with 4 way tilt rod.

Unitrack has been around for many years and supplied by Uniline Queensland.

If you only require new hooks they are sold separately  here:

https://blindpartsaus.com.au/product/carrier-hook-for-vertical-blind-track-unitrack-hook-style-new-sold-individually/

The old hooks take a bit of effort to remove, but the new hook should push straight in.

On most occasions it is best to replace the entire hook and this will require the removal of cords and then replacing them later, take photos of where the cords are located prior to removable.