making 7 hole adjustable trailing arm brackets

[tranz am]

Hey everyone, been a while, but I'm back on my project.
I decided to start this thread because I have been unable to find brackets for my trailing arms that suit my adjustment needs. I am also running NASCAR trailing arms which incorporate a mono ball bushing and a slightly wider bracket it s necessary to run them. I figure some of you might find this interesting or helpful.

heres where I started.
I have decided that it will be stronger with 8 holes instead of 6. I have upgraded the hole size to 7/16 and will be using fine pitch grade 8 hardware.