Here is a picture of a rabbit mix you can buy at a produce store, and while it is not what I am planning, it is close
I'm looking at Rabbit Pellets (45%), Oaten and Wheaten Chaff (40%) with a small amount of Lucerne Chaff for winter (5%) and then a small amount of commercial rabbit grain mix (10%). Or something close.
If I could buy some equine pellets cheap I would add that too, but I would have to buy a whole bulk bag, and as it is I am not sure our rabbits will go through the bulk rabbit pellets in the 3 months recommended.
They are given oaten hay each day as well on top of all that. They also get fresh food a couple of times a week, but most of the time they refuse to eat it. The baby is the only one who eats fresh.
They have been raised on a mix of pellets/chaff/seed which is why I would like to continue (as they are doing fabulously on it).
Thanks for all the input, I will research it some more!