They are not very difficult to make. You can take look at a bunch of photos on Google
and fabricate your own if you can't find one. Here's a photo of one I made several years ago,
simple but very functional. It's on an old Springfield lathe.
earl----this lathe will ''swing'' 19 inches. really not sure what u mean?? when u ask for ''center height??. steve in mt. 406 596 7960 . will measure lathe and respond---need just a little more coffee. lol. when u have some ''free time'' please call. re steve in mt.--OK i took measurements on lathe and have enclosed 2--pictures. from top o ''V'' to center of ''flat'' it is 8 1/4 inches. now from ''flat'' straight up to center of spindle it is 9 1/2 inches . hope this is what u need. see atttached pics. re steve in mt.