Receptacle box for Hubbell HBL9450A

[WADan]

Hi all,
The Hubbell receptacle appears to be too deep for regular box (which is 2 1/8”j, and I am having trouble finding one that is suitable for mounting on interior wall (with 6 gauge wire running inside conduit). Please help! Thanks!

 

[TORQU3]

Are you using a two gang box? The drawing says it should mount in a 2-1/8 deep box, it can be hard sometimes with larger gauge wire. Sometime you need to pre bend the wire a bit and really work it in there.
https://assets.usesi.com/product-media/technical-drawings/USESI_4636_technical_drawings.pdf