Fast zener diode substitute

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I decided to built this:

It keeps the battery a little bit active, preventing sulphation by
loading the battery with a hefty current (40 A) for a short interval
(50 μs) approximately every two minutes.

But they used a fast zener diode (BZT03 27V) across the FET for
protection, as rather large voltage spikes can occur when the FET
switches off.

I can not find this diode where I am, so can you suggest a substitute? I
guess I can not just put regular 27V zener diode here?

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     /__/  /    \      ** Registrovani korisnik Linuksa #291606 **
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