Garage door lock replacement

[Mr hello]

My garage door lock needs to be replaced and I need some advice on what needs to be replaced and how.

1. The front lock I don't have a key and cannot rotate it so I will definitely replace that. Here is a picture.

Will something like this do the job for the front lock? https://www.screwfix.com/p/garage-door-handle/74579

2. Here is a picture of the internal handle.

I can open the lock from the inside to free the locking arms and open the door. However, the spindle does not rotate when I do this and I remember the internal handle once separated from the spindle so I pushed it back in place to sit on the spindle. I think a part fell out too at the time.

What type of inner handle do I need to buy to replace this as I haven't seen an equivalent in my online searches? The locking arms don't need to be replaced so can I simply buy an appropriate external and internal handle?

 

[footprints]

The Screwfix one should be fine (you might need to juggle with some spacers to get it just right) I had just a wire you pulled to open mine on the inside.
If your existing inner handle cannot be sorted out (might just need a hole drilled and a self tapper to lock it) I did find this on a search lots of bits there.
https://picclick.co.uk/Cardale-Wickes-Wessex-garage-door-inner-handle-lock-220948523274.html