Many thanks for the guidance. I’m Canadian and while trying to find someone who will ship to me I came across this comment from Excel Sports, Boulder on their Shimano Ultegra 42 T ring.

“Although it features a 130mm bolt pattern, it should only be used with triple cranks because the tooth profiled and ramping are specifically designed to have this ring sandwiched between two other rings.”

It seems everything I look at is for triples. Is this likely to be a problem?