In article om,
wrote:
It's for an older car, and new heated replacements aren't available
anymore.

So bodge it. Find something else that's practically the right size.

Failing that, buy a big one and grind it down.

That's a possibility that occurred to me since BMW E39 ones are only
slightly oversize - and incorporate a 'blind spot' section. However,
they're of the order of 40 quid each.

--
*I couldn't repair your brakes, so I made your horn louder *

Dave Plowman London SW
To e-mail, change noise into sound.