Substituting this MOSFET?

Can delete this post now, posted in high voltage instead. Thanks.

I've started on building a plasma speaker, would using **broken link removed** instead of **broken link removed** be a suitable substitution?
Here's the schematic: **broken link removed**

Also, with the MOSFETs I want to use instead, would I be able to not use 12V zener diodes as they're 'Zener Protected'?

Thanks! x

IRFP250 is a high power PMOSFET and are available freely-- check at element14.com or with mouser etc
why trying for another replacement ?