I don't think any of the previous questions on this topic cover this particular nuance, but please edify me if I'm mistaken. 

I have a Macbook Pro 15" (the model that was released around March 2011) with Thunderbolt port. My office has two Dell monitors joined with a DVI splitter (which were originally connected to a Dell desktop). I have a Thunderbolt to DVI adapter that I was hoping to connect to the DVI splitter. However, the connector on the end of the splitter is different from the connector for a single-monitor DVI cable, so I can't plug the output of the splitter into the DVI end of the Thunderbolt-to-DVI adapter. 

Does this mean I need either (1) an adapter to connect a "standard" DVI connector to a "splitter" DVI connector, or (2) a thunderbolt adapter that will plug directly into a splitter DVI connector? If so, do either of these items exist or am I out of luck?