yes, i do mean the rubber insulators from the 620. I have read that some use the stock 510 insulators with the KA brackets. Others use the 620 insulators along with the KA brackets as well. My question is im looking to use the 620 insulators and I was wondering if you use both the left and right insulators or do you have to buy 2 right sight insulators because the left and right are different. hope that makes sense.