That's not a wetplate holder. It is a contact printing frame for making prints from negatives.
A true wetplate holder loads from the rear. A door is opened, the plate inserted and the door shut, with a spring on the door applying pressure to hold the plate against some sort of retainer in the corners or all along the edge of the cutout area. There is a single darkslide on the front. The following picture shows a wetplate holder that incorporates an insert for a specific size plate:
Other than special order from a woodworker like Alan Brubaker of AWB, the only 8x10 wetplate holders that are currently available come from Jody Ake or Chamonix (AFAIK). The Ake holder doesn't give a full 8x10 image because of the ledge used to hold the plate at the focal plane although it does take a full 8x10 plate size. I'm not sure about the Chamonix. You might also find old Graflex plate holders on ebay or adapt either a modern film holder (Lund Photographics sells modified film holders) or plate holder. Because something has to secure the plate, most modifications aren't quite an actual 8x10. To get a true full-frame 8x10 image, you may need to go to the next camera format larger and adapt downward to get the size you want (e.g., 11x14 to 8x10).
Since you already have an 8x10, you may have to settle for a slightly smaller image (maybe something like 7 3/4 x 9 3/4 image) with an adapted film holder or Jody Ake's design (
incameraindustries.com) or just live with an adaptation and the next smaller format. I do the latter and actually prefer the whole-plate 6.5x8.5 format to the 8x10.
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