correct cartridge replacement for bristan

maxforce111

Hello,
I'm having a problem with my shower mixer, the hot water doesn't quite come out unless I open the flow to maximum and even then its not as hot as the other taps in the flat. I'm pretty sure its the thermostatic cartridge and I'm trying to identify the correct cart for it
I've been advised by bristan that my shower is from their old prism range and has a code PM TSHCVO C and looks like this:

i.imgur.com/wCO8B5K.jpg

they've advised that there are two possible replacements cartridges for that model but I don't have more info, when I look online I seem to land into this

showerspares.com/search/bristan_nylon_screw-in_thermostatic_cartridge_00622415
which I think its the right one I was wondering if anyone can confirm this is the correct part?

potentially it could also be
showerdoc.com/bristan-t-static-cart-shwr-bar-mixer-cart-06734b

thanks in advance!