I'm looking for something to fit in the cup holder that will hold the head unit from my FT-891. I've been looking at the ones for cell phones and tablets but I'm not sure which would work best and don't want to do the buy-try-return-buy again-try-again method when someone may have already done the work for me. If you have something else you've used besides a cup holder device, I'm open to suggestions. TIA!