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Tbh the best way to do it is just constant little tweaks until it fits where you're happy with it, you won't be able to just bend it in one way and have it fit perfectly as it's quite tight on the length of the pipe as it is, you'll need a fair few bends in a few directions. I spent ages doing mine but don't have a pic handy I'm afraid.
All I can advise is get the rad sitting roughly in position at least and then try and gauage it from there or just wait until its all in and fit and bend the pipe that way, that's the way I did mine, was much easier in routing respects.