Today I went to Screwfix for a gate latch, while there I also spotted these below in the book, a jointing plate 97mm X 35mm & 2mm thick 10pk £3.49. code 66707.
https://www.screwfix.com/p/jointing-...questid=397224
These look to be just the job also if you require to do this fix on the tourer tail gate, you would have to drill a centre hole to allow the ball socket to screw back into the car as above in the how to photo's.