Trying to find a suitable A/C load center replacement

Doing some googling, I think the best you are going to do is a 2 space, 4 circuit load center, like this Homeline Homeline 2 space 4 circuit load center



It should accept tandem breaker. It is available at Home Depot, Lowes (both will likely have to order it) or Amazon. You will likely have to order a ground bar.

Any of the 4 space load centers are too big.