The Savage 24 is little more than a Savage 94 with a second barrel and selector.
Most of the parts are exactly the same.
Whenever a change was made to the 94, the 24 changed as well.
The Savage 940 is one of these variants.
The aluminum framed, side lever 24s will use parts from the 940 series.
It may help to know this in your search.
It is possible, but I have no personal knowledge of this, that the lock for the 940/24s is the same as the part for the 94/24 without the stamped steel extension.
I do know that most the small parts in the barrel/ forearm are interchangeable between the two.
There are two resources I can mention that may help:
Lee's Gun Parts in Irving, Texas:
http://leesgunparts.com/
And the Savage 24 forum:
http://savage24forum.boards.net/board/1/savage24-forum