ACEd, I got your PM, although my PM box is almost full.
Glad this older thread topic shed some light on your DAO/lever question.
I don't have any of the DAO spacer levers, which are basically patterned on a TDA gun's sear release lever, but without the "foot" (needed to engage sear nose for decocking in TDA guns), and with a extra couple holes in the upper body of the lever.
This is a handy pic I found on one of the vendors who still occasionally gets new S&W 3rd gen parts to sell:
Smith & Wesson Firing Pin Retainer Spacer S&W 3953TSW 4043TSW 4046TSW
Checking the frame cut on the right side of the hammer is simple enough. If there's room for 2 levers in a DAO gun's frame to the right of the hammer, then you need a spacer lever alongside the firing pin safety lever, and a spring underneath them.
This is my 4013TSW showing the extra width of the lever cut made to contain 2 levers on the right side.
Both levers -
Only 1 lever -
No, there isn't any Jesus spring under the right lever(s), because I removed it for the purpose of taking those pics, but for normal assembly and functioning of the TDA gun (and a DAO gun with space for 2 levers), it's required.
Pretty apparent, if you know what to look for.