DR750 needles are 5E53-3RD. DR800 needles are 5E53-3RD or -4th depending on country (in Belgium I think it is 4th). For last generation DR800 some countries got needle 5E96. Just FYI - make sure you check needles seats. If needles so worn seats might be worn too and if this is case you are in for a bit of bad news....e.g. carbs body change. Thou those are easily sourceable from eBay since I think GS500 use same carbs.