This model is missing part from Stanley Latch. Second part already exists here: https://www.printables.com/cs/model/221151-stanley-rolling-workshop-stst18631-latch
And inner part was nowhere to be found so I recreated one.
I recommend printing with support from base plate only and it requires very little support.
Tested and fully functional with rather snug fit.
Use PETG or ASA/ABS so it is a little flexible. Print settings I used was 0,6 nozzle and 0,2 layer lines.
Stanley replacement yellow plastic latch, part number H2600065150
The author marked this model as their own original creation.