Arty,
I have an aluminium grass catcher that came with my 1951 Atco which is an English model only 14 inch cut but I assume the shape is the same but wider, I cannot access the catcher at the moment (Covid Restrictions) but will take measurements and template and can draw up on CAD and post here, it may be sometime before I can do this.
On ebay silensmessor is the name of the decal site his name is Grant and good to deal with, go to ebay and search Atco Decal he will come up, he has quite a lot of decals for mowers.
Beech.
