vacuser
Dwayne,
The very first Classic 1CRs built in early 1970 actually had the exact same fan case and front axle as the Dual Sanitronic 50 and 80 (part no. 120065) so, the nozzle from those two units could fit on there. But... the headlight hood will have to be shaved down from the bottom, like what they did on those Heritages/Legends to take the 13" nozzle.
~Ben