MK ??????

Hello, I bni since yesterday Ford Transit MK 3 owner. What does the MK????? I am looking for contacts to people who have spare parts, know each other. I register my transit next week and pick it up on Friday. I need information on the conversion of the seats front. I am 1.97m tall and sit rather uncomfortable on the original seats that are already badly “underrided”. Thank you in advance. Sebastian