Speedometer gear question

Hey guys,
Just trying to get some thoughts on what is the correct speedometer gear for my setup.

Rear axle ratio: 4.10
Tire size: 275/70R14 which works out to a diameter of right around 29".

It seems I fall right between a 2538939(Green) and a 2538936(Red). Is it better to step up or down?

Also, where is the best place to buy the proper gear?

Thanks,
Bryan.