Cortina mounts are good i've used them. I've also used sunny mounts which look much the same only stronger or you can use two bits of flat bar about 40 by 4mm and use two mounts side by side with the flat bar top and bottom If its a later A series motot on an early crossmember then one mount bolts through the crossmember and the other mount bolts through the engine mount. Also fixes the problem with different engine mount positions
Hope this helps