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.
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.
Jack, Here are the pics of what you need to do. The shallow nuts are known as jam nuts. I've got the engieering drawings for the rear lower suspension collar that I showed you at Monterey. PM me you email adress and I will send them. Regards, Rick