What color where 1972 Texas Truck Plates?

[Z10]

First I lived the dream in 1972. Been there done that. In fact that's the year I graduated from high school. My high school colors were green and I thought it was pretty cool that the 1972 car plate that I put on my 68 Z/28 was green on a white back ground.

So, I recently purchased a 72 GMC Step, then purchased 72 Green/White plates on ebay and took them to my local Texas Tax Office to register the truck using these really nice plates. The nice lady behind the desk tells me I can't use them because the letters are suppose to be blue/white. So, now I'm thinking I'm brain dead and I just wasted some money on the green/white plates.

Now I come home, check ebay again and several other sites and all I see are green/white truck plates, trailer plates, Farm Truck plates, dealer plates etc.

So, does anyone have a website that I can go to that specifically describes the color of 1972 Texas plates that I can take back to the Tax office and plead my case?

Thanks,