Pretty sure it is a T-50 As a side note. Those cheapo Chinese tork sockets shatter like glass on these bolts as they are often rusted. Buy a good one and use a breaker bar.
I would get one from Sears...a Craftsman. When it breaks...and it will....they will replace it for FREE.
Mine came out like butter! Just a T handle one was needed. I had more issues just trying to remove the plastic plugs
I had no problems with mine here inArkansas either, alothough mine do go in and out like the are going through a lock nut
Mine were tight enough to shatter the cheap torx I used on the first attempt. Once it broke free it wasn't hard coming out the rest of the way or going back in. Mine had/has no corrosion or rust. I'm sure they were set at a high torque due to the fact that "safety" was the concern. We all know that tighter is not always better or even necessary in some cases. I can't tell you how many "cheap dam" cross bars my dad twisted
A good 3/8" impact set on the lowest setting will usually break the threadlocking compound free without busting any knuckles.