I need to buy new wire wheels . 40 spoke, and im told that the measurement accross the top of the rim is supposed to be 3 inches by a dealer. mine look much wider and i´m not sure what stock should be and where the measurement points are. Also I need the length of the inner and outter fork tubes are for a stock 78. trying to restore it back to original and info on purchase of good specs book with all measurements and any repair info under the sun.