What they are is what they are...
Can't say if they will seize up or not, some do some don't.
My '98 broke one bolt and they were rusted bad.
The '03 was in great shape and none broke.
I didi exactly what you did with the lube, BP Blaster one week before and everyday after work until the '98's came out.
New replacement bolts and clip nuts are big, lite-galvi'd and expensive so luck to ya.
Salvage yards might have something, look under the trucks see what kind of rust is on the bolts, who know you might get lucky.
As I said I bought new, I just wanted to have new bolts with the new bed.