Ditmar Maxim 520 glass specs

I'm new to the forum.
Some years ago I bought a Ditmar Maxim 520 without glass. These days I remember to start restoring it and I want to find a glass for it.
Do you have any suggestion of where can I find one?
Do you have the exact glass dimensions?
Is there any equivalent in Petromax (because I have found that Petromax sells new glass in their website).
Thanks for the help.

 

For the Ditmar Maxim 520 you can use any glass cylinder of the Petromax 350/500 CP size.

 

Thanks