Thank you. Do you have a good micrometer? That helps a ton with getting the right fit for parts. I have heard that the frame tubing can vary in thickness, for one thing, so that what worked for one bike would not fit in another. Another thing to look out for with old frames is to make sure the seat tube has not been pinched together at the binding bolt. Look at the slot in the rear and make sure the sides are parallel. If they are pinched together at the top, you would need to open them up before trying to measure the interior diameter of the tube.