I thought 506 ends went with the 1035 bracelet and were 19mm and pretty similar to #6 ends. At least the one on my watch is (yes I still need another). I don't understand these ones listed on ebay at all - clearly numbered 506, but completely wrong and 18mm. Yet they look like old stock, are well made and would fool me completely if the number wasn't wrong. Interesting I thought. http://www.ebay.com/itm/OMEGA10-18m...8476532?pt=US_Watch_Bands&hash=item233edc3df4Purchases made through these links may earn this site a commission from the eBay Partner Network