I called Yesterford on Saturday. He has the rectangular type but they have the fixed stud in them, same as these ones-
http://www.basisnz.co.nz/product.pasp?categoryid=116&productid=1915 I also re-checked my measurements of the original 1300 mounts (681F block). Both brackets and rubbers are the same length. 4" bracket and 30mm rectangular rubbers on both sides.
Whereas the mounts that came on the 711M block have 50mm round rubbers on each side but one bracket is shorter than the other by about 15mm.
I have been told that the MK1 and MK2 crossmembers are the same. So does that mean a 711M block is 15mm wider than a 681F block?
Should I be using the mounts that came with the 711M? And if so, which side is the shorter mount fitted to- driver or passenger? Another thing I'll most likely need to do if I use the 711M mounts, is slot the holes in my crossmember. At the moment it's just a 10mm hole.