The SL's 90's (Rare) 100's and 125's and the first two XL100's all had the non leading axle forks . SL100's run front 19 inch and rear 17 inch wheels . 125's run 21 and 18, the 100's have flatish tops on the mud guards front and rear where as the 125's have the more rounded valanced style as in the Yellow peril above. All have the speedo drive in the front hub. SL 125's also had a tacho to go with the speedo. The one for sale is an early 1973 SL100 going by the standard (badly faded) paintwork, late 73 onwards they became XL100's in Australia, (same bike though). Trust me I have the odd one or three. Cheers Tim754