Recently acquired a Mana 8'5 GT.
It has a thruster set which seems a bit large.
Centre fin is about 220mm and side fins about 110mm.
Can anyone advise what fins would be suitable?
I'm just an intermediate surfer and normally surf mushy beach breaks.

I had the shapers Jackson close fins in my old mana 8'5 and they worked a treat.

Thanks Jason.
What size were they?

I cannot recommend the VP V8's/V6's highly enough. I have them on many of my boards as do my mates.

Thanks for the advise but the board isn't worth much so don't want to spend much on it.
The main thing I think is the rear fin at about 8.6" seems way too big.
Anyone got some used fins from when they upgraded?

Just find a center fin of about the same depth as the side ones: 110 / 130mm
By shopping around you should find quite cheap ones, as the center fin do no need to be as rigid as the side ones, no need for high tech construction.

Thanks Colas.
Validated what I was thinking.
About 5" fin seems the go. Will search the web and mates for a bargain.