While there is a songle relay part it isn’t this one (and has a different form factor) , so I made one. In general a google search of the form “fritzing part SRA-12VDC-CL” will find existing parts. There hasn’t been much new documentation on parts making, but here are the standard two tutorials:
Fritzing PART CREATION Video Tutorial Series
I lately learned there aren’t links to the videos in Old_Grey’s tutorial so you need to do a google search for the title and then they come up on YouTube.
They have both been around for quite a while so you may have already seen them (and things have not gotten any easier in the interrum!)
Peter