This is the original style 4 hole flat adjuster plate with the holes on 7/8 centers.  If you have the guy hook on the deck or do not use a spinnaker you can put two of these on each shroud.  If you do not have the guy hook on the deck but you have a spinnaker you will want to pair this with one hooked adjuster plate and the link to the pair is below.  If you have the guy hook on the deck and want a more fine-tuned adjustment you will want to go with the 6 hole adjuster which is standard on all racing Flying Scots.  The link to that adjuster is below as well.