I can help you here : I recently fitted the new Nosram 5000mA saddle lipo's (wanted to keep my options open when the SV arrives). They're supposed to be 25.1mm high and indeed : the fitment under the front pulley was a problem. I had to raise the front bulkheads by 1mm. Now they fit (barely, but good enough). If you're worried : I didn't feel any change in my setup so I'm guessing it won't effect performance.
The Nosrams have the humps so they fit perfectly in the cutouts in the chassis. I you don't have the humps : just get the Northy or AC lipo locator. To connect the saddles, I simply took an NiMH battery bar, cut it to length and soldered two corraly connectors to it to replace the saddle wire.
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