Correct color for the rear leaf spring “BM” tags?

[Dave69x33]

According to Jerry MacNeish's '69 Camaro fact book, the rear "BM" tag for the 3934894 leaf springs was silver paper with black lettering.  When I initially restored my '69Z, in 1995 – 2000, I purchased silver or light gray tags with the black lettering from Rick's 1st Gen., when Rick George still owned and operated the store.  I need to replace the tags but now, I can only find yellow tags with black lettering.

Which is technically correct?

Based on JM's book and my previous purchase of silver/light gray tags, I tend to believe that silver/light gray paper is correct.

Does anyone still have original springs with the BM tags still intact on springs, and provide a picture to confirm the color?

If I recall correctly, the assembly manual indicates a color code on the exterior eyelet surface of the spring.  At one point in time, was the spring color coded then a switch to color coded tag used?

Thanks in advance for your input.