Old Engel 38lt green/cream, new transit bag

G'day guys

Just wondering if anyone has had the same issue in finding a proper fitting transit bag for an old Engel. I have a really old Green/ cream one 39lt. I purchased the 540 bag (which they say is suited to the 39lt). But when fitting I have found the handle holes to be alot higher, the vent holes are higher also and the bag sags as the fridge does not fit height wise. I gather Engel make a generic transit bag for the old/new 39lt models. I'm thinking that I will have to prop the fridge up inside the bag with a piece of wood or similar. Anyone else had the same issue?

Thanks

Chris