Kia Troubleshooting Questions? Ask a Mechanic
Hello I will help you with your question,
Are you asking about the head size or the thread/length size?
I'm sorry I thought I knew, I believe they are 50 but I am not sure. I just have a rack of torx drivers and grab what fits without looking at the size so I will OPT OUT of your question and maybe another tech will have the exact size. The bolts MUST be replaced once you remove them, do not re-use the bolts
Sorry I could not help