ID help with front disc brake setup on my '64 C10

[trulordd]

Ok, looking for a bit of help. Heres what Ive got that I know;

My truck is a 1964 C-10. I have been working on the back end going to full disc and all, stage 2 bag kit and new training arm cross member. I am almost ready to move to the front.

The front end has 5 lug disc brake setup someone put on some time ago. It still has the single manual master cylinder that I am going to swap out with a boosted one. The truck would stop when I was driving it so I know the front discs work just dont want to stay 5 lug and dont want to have to buy a complete 6 lug conversion kit. On to my question;

What is the best way for me to identify what front brakes I have on there? If I can, I can just get the 6 lug version and stick with the calipers I have.

Thanks for any help with this and I should be starting my build thread before too long