dequall- I'm only on my 6th rack and by
#2 I didn't want to make more tabs... I have a stash of various tabs from different sources and find these are my favorites. The trim shape sits well with my aesthetics and are as strong as I need. This is on the Framebuilder's Supply site that I earlier linked to.
Here's an exception to my "usual" tab preference. Home made to allow for 2 braces to attach. Note the poor thinking things through that resulted in the struts not bring symmetrical WRT the tab and mounting hole.