Steyr LP2/LP10 rear sight

Hi
Wonder if anyone could recommend a rear sight for a Steyr LP10.
We are putting together a LP10 as a laser for use in Modern Pentathlon and have everything we need in terms of action, grip, laser barrel etc but are missing the rear sights.

We could just spend a load on a new Steyr one but before we do that we wanted to ask if anyone knows of an alternative that A. will fit a Steyr LP10 without chopping it up and B. is readily available in the UK.

Or of course there may be a chance some one may have a complete rear sight for a Steyr LP2/10 for sale?

Must be cheap as for my daughters spare pistol but cash and grateful thanks waiting.
Any opinions would be most welcome.

Many thanks