When we built a house I bought this Dynamix 9RU cabinet but I never used the swing mount part of the cabinet because the location of installation was changed and I couldn't be bothered to exchange it. Someone else may have a use for it but we don't. If there are no takers it is going to the dump

https://www.pbtech.co.nz/product/CHSDNX0105/Dynamix-RSFDS9-9RU-Universal-Swing-Wall-Mount-Cabi

 pick up only, we live in Wellington