Hi Dale,
You're a long way from a full cap. I know it's painful to see hair loss. It looks like more of a temple recession issue. I suggest a long narrow piece that would go from temple to temple and bring the hairline forward slightly. This would add fullness to your hair and allow you keep your own hair. If more is needed in the future you can always get a larger unit. But this is a good place to start.
Regards,
John