Safari is going to do it!! 4 - 4.5 gallons

http://www.cafehusky.com/attachments/dsc_8404-jpg.5218/
The tank holds 20ltrs approx

Here's our Safari tank on the TE510

Good news for the late model 630's and 610's http://www.safaritanks.com.au/home/14-Husqvarna/63-Husqvarna-TE630/flypage.tpl.html
But you probably already new that hey

for those who are looking for a few extra kl's safari will soon be selling rear tanks for '08 to '10 te's.

Have you experienced any over heating issues after installing the tank.

It's pretty common on tight trails for oversize tanks to trap heat. I have seen boiling fuel at crossover fittings were the tanks low sides manifold together on tight singletrack.

It will run hotter in the slow technical stuff, wide open riding with air flow it seems to run the same. I only run the Safari on long dual sport rides and use the IMS for most of the riding I do.