Sorry I missed all the replies to this... I was originally subscribed to the thread and got e-mail notifications, but apparently my e-mail started putting them in my spam folder.

Anyway, I just wrote a follow up of sorts about what I dealt with to find the correct replacement bolts and happened to took a look at this thread again.

To anyone wondering, I used a Pittsburgh Pro bolt extractor set (P/N 67894) from good old Harbor Freight to get the stuck bolts freed. I needed to cut the outer CV boot to get the socket in there, but I was planning on replacing it anyway. In normal cases a crescent wrench probably would have worked, but these were stuck on pretty tight so I needed the leverage.

VX Kat, a (very) late thanks for the offer on the control arm, but I'm good now. My task for this spring will be to control my underbody rust, so hopefully my control arms will look like that in the end.