Reply from U-Bolts-R-Us:
Unfortunately with manufacturing tolerances of +/- 1 mm, and these two products being on the limit of compatability, it can cause problems.
We knew they were on the limit, I checked them myself. I made a decision to send. Sometimes the end user is more happy to get something they can work with, rather than have nothing at all.
And as is always they case with internet sales, if they are no good they can always be returned for a full refund
We sent the products hoping the customer would be able to use them. Unfortunatley they could not. A case if we send they would be unhappy, if we did not send (knowing there was no alternative) they would be unhappy.
A rare occurance, but we did we we thought would give the customer the option to decide for themselves, rather than us making the decision.
We are always happy to take back products in these rare situations