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They dont seem to be very standard sizes so i guess we’re going to have to make new holes?
Not necessarily. The standoffs are usually movable horizontally so "all" you need to do is find one where the bar spacing means they align vertically (don't forget to budget for the position of the tails - you may have to trim them to get it sat just right).
Edit: electric means no tails so even easier.
That said, get some filler to match your grout and you won't notice the old holes behind a new rail.
Our bathroom has an electric towel rail mounted into a fully tiled wall.
its never worked properly since we moved in, the control unit was not working properly and only let you turn it on or off manually, now that unit is totally bust and we cant turn it on at all. Its ‘chrome’ but rusted badly. Googling it seems like an off brand very cheap unit.
We want to replace it with something better quality..