Gas locker for an Elddis sunseeker 25

I need a new gas locker, mine was damaged by a Green Flag "recovery" following a tyre blow out (Green Flag dealt with this very well). This Elddis model is "obsolete" and Elddis not only don't have any parts for my van, they cannot tell me if the same locker is used on their later models. However they still have the peugeot boxer chassis and the autoquest range have a simillar locker in the same place and surrounded by a similar moulding. It looks like it's the same size. The photo I have studied most closely is the Autoquest 145 suntor, it looks like a close match. If I can have a chassis number from a member with an autoquest 145, my garage will reference the replacement locker,  check it out and compare the sizes. Can any member help with this or with the dimensions. My gas locker is approx 590mm height and 435mm width. A chassis number for a 145 suntor would be ideal.