413 wedge code ?

Hi guys you all have been amazing.
I have a 413 wedge v code. The casting number looks legit. Here is my problem.
The books all say it should have a RB under the casting. But I have a R L. ? Strange
The date code looks like 2.64. Any thought about the RL. Casting. Passenger side says
Ndrl.
Thank You !!!

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