Reefing Block

Does anyone know where I might get a SLATER reefing block like this one that rivets to the side of the boom and has a 2" sheeve and will take up to a 7/16" line?  I'd like to match the ones that are already on the boom if possible (trying to keep the Dr. Seuss factor to a minimum!)  I couldn't find much about the company online......I wonder if they have gone out of business?

thanks,

Brian