Bendix (early) Compact 7159 Door Boot fitting instructions?

I have an old Bendix Compact model 7159 washing machine.
It works perfectly well but the door boot is perished (hard and cracked) and leaks a bit.
I have located a replacement door boot but I can't find any fitting instructions
There seems to be a metal securing ring holding it in place and bolts around the opening --
I'd rather like to know that I can fit it before I order it.
I've searched the web but with no result.
Can you help with fitting instructions as I doubt that there would be any with it.
Thanks
Hugh McDowell