Hi! I searched in the forum but found only answers concerning the 6TB version WD 64 mb. I am planning to buy this from ebay, but I am not sure it will physically fit the mac pro 4,1 I have. https://www.amazon.com/gp/product/B01CHP20MG/ref=ask_ql_qh_dp_hza Could someone confirm that this can go in the mac pro with ORIGINAL sleds? Thanx!!