It's either an Alko 1300, 2000 or 3004 model but you shouldn't need any bracket for a hitch lock to fit. If you can show a link with the model stabiliser hitch you have then this would help.
The one shown is the same as mine which is an Alko AKS 2000 model and the hitch lock for this model is different to that for the 1300 and 3004 models due to the red stabiliser handle being offset. Mine is made by Pyramid and cost £30 new which just swivels open at one corner without any further brackets required which is shown in the link below.
found a local caravan company and the guy had some brackets but no bolts called up my local bolt supplier and bought a pair of allen head cup bolts 12.9 grade one 90mm with lock nuts had to cut 5mm of when fitted, and one 75mm
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