I have 4 lower A-arm support collars water jet cut from 1/4" 4130 moly and powder coated. Superformance MK1's did not come with these as the original cars had. They are a must if you track or aggressively drive your car. they are $100.00 + shipping from Socal.
No, You can use the same bolts just discard the large washers on the a-arm bolts.
I replaced my a-arm bolts with new grade 8 because they were slightly bent. It's probably a good idea to replace them anyway.