Missed that. I am too. In that case, you probably want a taller and cushier pillow than those made for back sleepers because on your side your head is higher off the sleeping surface and needs better support.
My solution is a pillowcase called a Monkey Pillow, used to be a guy on here who made them but he quit doing that, but basically it’s a UL case with soft fabric on one side and elastic to wrap around your pad. Inside I put a FlexAir inflatable pillow but only inflated about halfway so it stays flat it’s really just to take up some of the volume of the pillowcase. Then on top of that I stuff in my down puffy. You may only need to stuff in a down layer by itself, but I find the down compresses too easily and my head sinks all the way to the bottom. But with the FlexAir taking up some of the space, the down stuffs in a little firmer. Result is a soft pillow that my head sinks partway into, and the down fills the gap under my neck very nicely. It’s big, I think 19×13, and the pillowcase and FlexAir together weigh under 3 oz, well worth an extra ounce for a good night’s sleep. With the size and comfort, it is as close to a home pillow as I have found for the trail while still staying UL (since I’m carrying the down puffy anyway I don’t count the weight of it towards my sleep system).