HPV SMGT seat sizes?

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I've got an old model Streetmachine and I'm getting back into riding it after nearly 4 years. It feels like the seat is too small. I feel like I am slipping off the bottom and the top curves into my back a bit. I'm 6'5" tall so it could be I've got quite small/ medium seat not the large seat size or I'm just on the edge of the user height for the bike.

Anyone know what size the old GT model seats were so I can check what I've got? Also, what user height ranges were for the original seat of the GT model? Where can I get a suitable larger seat if I needed it?

I really can't find any information on the older GT model.

BTW I've got the one piece glass fibre reinforced polymer seat not the ergomesh that was a option. I think they had small/medium or large seat options.

The other question is whether it's possible to put the seat upside down? I think I have accidentally put it on both ways round. It looks like the seat curves up at but ends in a similar shape which could explain the slight digging in at the neck/upper back.
 
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