Manufacturers seldom use an off the shelf chainplate, most are custom for each model. You might be able to find one similar but probably not exactly what you want. The hole has to be the correct size for the toggle or turnbuckle your rig uses. A hole too large is a problem. What boat do you have? Maybe someone here could help more if we knew.
You're saying there isn't any specific brands of chainplates that people tend to favor like Harken or Schaefer. I thought maybe someone knew one, that is pretty much what I was asking. The holes being the correct size and thickness is a given. already asked the group for the boat but my rig is a custom job very different from the originals.