UK based, source for USMC front sight blade?

[oldfoneguy]

Although not an exact answer to your question, I add color to the milsurp front sights I have trouble seeing.
Nail polish, enamel model paint and spray paint are just some of the possibilities. I've used white which could be problematic at times, bright yellow works well, orange is OK unless you're using an orange target, gold works well also and safety vest green is good except I have some targets that color as well. No adding color doesn't make the blade wider but it does grab your eye faster than a blued or black front sight.