after market tank for a 82 rm125?

Anyone know an aftermarket company that makes a larger tank for a 1982 RM125 anymore?...i ride trails and sometimes going far isnt a reality due to the fact that my bike will only last a few hours on gas and the tank is only 6.5 litres. Also does anyone know of an aftermarket pipe company that still makes pipes that will fit my bike?

Thanks, any help would be appreciated.

Cool, thanks
Is your tank in good condition and how much would you sell it for?...now i just gotta look around to see if that tank will fit on my frame.