NDF-01 FR-15S parts

Looking for a nip piston liner and piston for the Tamiya FR-15S engines. Would consider a whole engine is it was in good to near new condition, Would also consider other rear exhaust type engines but no bigger then .21 as the gearing wont stand up to it! This is to help get 'stink bug' back up and running for the spring/summer. these engines were found in the NDF-1 cars such as the NITRO THUNDER and NITRO FORCE.
thanks in advance