A new MV member PMd me asking about putting UFPs on his Beverly 500. Always up for a challenge (and new markets) I studied some photos to see what modifications might make it fit.
The BV's floorboard has a longer, mostly flat length of rug. The upwards swoop the MP3 has in the front that so severely limits where you can place your feet does not exist on the Beverly, and I assume that the stock Beverly is therefore a more comfortable ride than an MP3 when it comes to leg extension.
Unfortunately, that upwards swoop - and the fact that because of it, part of the MP3 floorboard exists in a different plane - is what makes the UFP possible. The UFP would not be secured nearly well enough if there was only a single planar surface to attach it to.
Sadly, I advised him to check out RamblerDan's footboard modification (which while complicated doesn't rely as extensively on two separate planes) and search/post on the General Discussion to see if and how others may have approached this.