Having trouble sourcing the grips and would appreciate any help members could give.  After new or near new, but will consider any black heated grips.  TIA Alan in Australia

This is the part number for left heated grip of that vintage 
61312300387

And this is the right hand side
61312300388
And this is a common fitment between these motorbikes

• R 65 GS, R 80 G/S, R 80 ST (80-92)   (05/1980 — 11/1992)
  
  
• R 65, R 65 RT, R 80, R 80 RT (85-95)   (03/1984 — 12/1995)
  
  
• R 80 GS, R 100 GS, PD (87-90)   (12/1986 — 07/1990)
  
  
• R 80 GS, R 100 GS, PD (90-95)   (04/1990 — 02/1996)
  
  
• R 80 GS Basic (96)   (01/1996 — 12/1996)
  
  
• R 100 RS, R 100 RT (87-95)   (07/1986 — 12/1995)
  
  
• K589 (K100, RS, RT, LT)   (05/1983 — 10/1989)
  
  
• K569 (K 75, K 75 C, K 75 S, K 75 RT)   (12/1984 — 06/1995)
  
  

Many thanks Mod Erator.  VERY useful info in my search.  Cheers, Alan