I looked pretty hard for this a while back. Ended up "repairing" mine. See https://pinside.com/pinball/forum/topic/the-shadow-club/page/77#post-3762827

I recall that at the time I found something at http://www.pinballspareparts.com.au/catalogsearch/result/?q=A-18956 but they had the p/n's flip flopped (i.e. -1 is right but shows a picture of a left diverter bracket and -2 is left but shows a picture of the right diverter bracket). I tried to find out which was correct the label or the picture but couldn't get them to work with me on that so I punted.

Still, if you don't care you could just try to order the "-1" (i.e. right bracket) which has a picture of the left and hope you get the pictured item.

Good luck.