Additional District Sessions Judge Luqman-ul Haq also imposed a fine of Rs 12,000 each on Rizwan, who is a trader, and Sabir.
According to prosecution sources, Delhi-based trader Rajnarain Bagla and his accountant V K Jain were kidnapped for a ransom of Rs 3 crore in December 2005.
The bodies of the two were, however, recovered a few days later, leading police to arrest six persons, including Rizwan and Sabir, during the probe that followed.