I left a reply on the original photo-they are RM250D,43mm,twin leading shoe forks.1983 was the only year they came yellow from the factory and the 125 was single leading shoe.They should work well,as long as they are mounted properly,in respect to the steering stem etc.They will be heavier in their springs etc,but you can overcome this with lighter springs etc-if you are over about 85kg's don't bother,just try them as is;don't forget you will need to stiffen the back up to get it better balanced front to back!