If the unit you have looks the same as in the previous post then doing an ebay search for GE RCD should reveal quite a few matches. Anything with the light blue writing or the half-moon test button should be OK.
All these unit will be either old or second hand, so please ensure it's been time tested by the seller, and that you have the means and capability to test it when installed.
Also note there are a few with a left-hand neutral terminal or flying lead, so make sure you buy one which is correctly handed for your board.
The half-moon ones look like this, and should not be confused for the newer equipment GE are flogging now which appears to be very different.
View media item 20831
All these unit will be either old or second hand, so please ensure it's been time tested by the seller, and that you have the means and capability to test it when installed.
Also note there are a few with a left-hand neutral terminal or flying lead, so make sure you buy one which is correctly handed for your board.
The half-moon ones look like this, and should not be confused for the newer equipment GE are flogging now which appears to be very different.
View media item 20831