Hepworth / Giacomini underfloor htg actuator compatability?

[gordonspants]

Hi, I'm in the process of fitting wet underfloor heating, using a Hepworth / Giacomini 12 port manifold. I need 8 extra actuators and don't want to spend close to £20 each on the Giacomini ones - does anyone know if ALL underfloor 240v Normally Closed actuators are the same, mounting-wise?
I've seen some on ebay for half the price but it's unclear whether they'll fit. I'll save £80-ish if they do fit. Every little helps etc etc.
Thanks in advance!

 

[crashndie]

there not all the same they differ between manufactures, stick to what you know and save cash in the long run