i saw a 1979 RM 250 for sale with a pro circuit pipe on it, well owner seller claimed it was that but i couldnt actually see the right side of the pipe, and i was wondering where they would of got it from. they are not listed on the website. also ive seen a pro circuit pipe on a 81 maico 490 and was wondering where these are available from. i asked pro circuit if they specially make them or still have the jigs to make one and they just said we dont have a pipe for this model RM, but im not sure if i just didnt get onto the right person at pro circuit. its a bit of a mystery.