Fixings kits for back-to-wall toilets...?

[NumptyMum]

We are on a tight budget for our house change-around (small extension being built, and 3 other rooms switching use...). So DH got a Roca Laura back-to-wall toilet pan off gumtree, but now I'm not sure about how on earth we use it, ie whether we can get the fixings we need. I've no idea whether there are universal fixings, or if we need ones specific to the toilet...? I'm feeling very clueless on this, so if anyone has any knowledge it would be really helpful to know more!

Search online for fixing details. Assuming it is a 'recent' model fixings should be available. You may need to be mildly 'creative'. Talk to local plumbing merchants.

I'm actually beginning to wonder why it was the person was getting rid of the toilet, having just come across a forum where plumber was trying to deal with a leaking back to wall Roca Laura... now I'm wondering if I'd be better to buy a new toilet rather than risk the one we have, but equally not sure what type of toilet to trust, given the forum also suggested Ideal Standard can leak! Aaargh, going round in circles again...

(Thanks for your reply btw, outabout).