You should ask in the modification thread if anyone has installed it on 3.7.3 and if it's working. Or, read the last few pages and see if it's already brought up. (I'm a firm believer you should always read the full modification thread to see what issues have been brought up so you are prepared when you go to install the modification.)
Some mods are backwards compatible, some aren't. As I suggested, the best thing to do is read the thread and see if it's been brought up. Also, you can always install it on a test site and see if it works.
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