[Roadsters] lower a arms and spindle nut size

[Tim]

I pulled the front suspension from one of my part cars with the intention of cleaning, de-rusting, painting, etc the parts that can be re-used. Then using them on my 1600 when I do that car's suspension this spring. 

Should I take the A-arms all the way apart to de-rust? Or should I leave the spring mount plates attached and treat that as one part during this process? 

What size is the nut on the lower spindles? I need to buy something big enough to grab this nut. 

TIA!!

Tim