Need rack mount kit for my XGS3700-48HP

Hi @adminpants,

Here is the online shop that sells the spare parts of Zyxel products.
Zyxel - LetMeRepair direct (letmerepair-direct.de)

However, unfortunately, the spare parts of XGS3700-48HP is not available now.
From your description above, you would like to have the rail kit.
Therefore, I can provide you the spec of the it:
For the rear bracket:


For the sliding rail:


Hope it helps.