Mercedes sprinter seats

I’m nearly at the end of my conversion and something I’ve left until the end is swapping out the seats as it just wasn’t in the budget but I’m really struggling to find many options online

I want to keep 3 seats in the cab but either have the 2 passengers fold down or just one of them, I’m not interested in swivel seats, I’ve seen this in VW’s but nothing on Mercedes

Do I need to full replace the seats or swap out the brackets

Any help appreciated

Chloe