As I see it , mine is a remis 1, 600 x 900 hole size 4 exterior hinges ,up a down only wind up mechanism, no longer available,
replaced by remis 2 wind up 600 x 900 hole size, but are not in full production dealers will order them for you paid for on ordering claiming 12 to 14 weeks waiting time , I have ordered a remis 2 from autosleeper , they ordered a batch in November for stock still no delivery date available ,I was told yesterday by autosleeper that they have been dispatched are on route to UK from Germany , problems now are , ****** , customs , covid , delivery problem's, war , and P n O ferries ,
Heki is more available still difficult to sauce ,but the hole size is 960 x 655 a big job to enlarge hole and re make the wood roof frame ,I have seen remis tilt and slide 900 x 600 second hand , Bazz