Replacing rear shocks

I have been in the process of changing my rear shocks and I have reached a point where according to the manual I should be using a 204-179-1spring retaining strap. I could not find these except for a website in England. One person in a forum said he used plastic ties. Sounded good to me, but I can only connect one side of the spring. I should be able to connect 2sides. One side has a round hole the other has a square hole. It is not very clear how the strap is supposed to connect. Has anyone actually used these things? Or has a workaround. Someone must have done this and can point me in the right direction.
Thanks,
Steve