Cohousing-L Mailing List: Postal release switch

[Katie Henry (katie-henry]

Another question for the architects. Does anyone have experience with postal 
release switches? This is an electronic device containing a lock that allows 
mail carriers to use their universal Arrow key to release the mag lock on a 
door and enter the building.
We need to buy the plate/switch combo. Easy enough. For example:
https://www.tristatetelecom.com/productdetailI2.aspx?dataid=PO-402

Someone from the post office provides and installs the lock cylinder.
The missing piece is that there is evidently a housing for the lock cylinder 
that we also need to provide. Extensive googling by our architect fails to find 
any information about this housing. Anybody have experience with this 
technology?
Thanks,Katie HenryHeartwood Commons Tulsa