I bought set of eBay. Cost around £50. And they have been ok. Cant remember seller. But just a wee tip to help when refitting carbs. Use 3 cable ties each side. Loop one round exhaust 1 and 4 , then loop one round carb inlets on 1 and 4 , then one tie between these to pull together. Wee bit at a time working both sides and once carbs are in rubbers the cable ties help hold carbs will you tighten everything up.