This part is no longer available from Yamaha. It has been discontinued. This part is a new reproduction of the original. The originals have deteriorated with time, as they are very old.
 
Part # = 90387-20177-00 / 214-27213-00
Part Description = COLLAR (20-24-31.5) (214-27213-00)
Model Count = 15
1968 Yamaha 250 DT1  
1969 Yamaha 250 DT1B 
1969 Yamaha 250 DT1S
1970 Yamaha 250 DT1C
1970 Yamaha 250 DT1M  
1971  Yamaha 250 DT1E  
1971 Yamaha 250 DT1MX  
1972 Yamaha 250 DT2  
1973 Yamaha 250 DT3 
1970 Yamaha 360 RT1 
1971 Yamaha 360 RT1B  
1970 Yamaha 360 RT1M  
1971 Yamaha 360 RT1MX 
1972 Yamaha 360 RT2-MX  
1973 Yamaha 360 RT3 
 
The part number is used for reference purposes only, and no source of manufacture or supply is implied. The price includes  sales tax. If you want additional insurance coverage, contact me before ordering. If you do not purchase insurance, I am not responsible for mis-delivered packages, lost packages, or shipping damage.