I have a 70' commando. I have no clue what "MK" it is... It was originally a roadster. I bought an ebay interstate tank made in india. I had issues fitting the tank because the 70's yoke offset is less than later models. With the tank studs all the way to the back of the holes that support the front, It was too close to the yoke for my liking,... So, here's what I did...
I took my cut off wheel and opened the circular holes in the wings of the tank support brackets towards the rear direction, then I did the same surgery to some giant sized thick washers. Then I got my welder buddy to weld the washers to the brackets, so instead of a circular hole shape for the tank studs in the support wings, I have an elongated oval shaped holes so I can pull the tank back wards. It helps with my low, short bars and smaller offset yoke to give me a little more space between the bars and the tank.
I did one other modification too. I had my welder add 1/4" of metal to each steering stop to limit the swing of my yokes, so my switchblocks wouldn't bang into my interstate tank...
