nyc123

Two questions on a 126 chases 1986 MB 560 SEL as I was thinking of buying one. I thought (assumed) the rear seat had 3 total seat belts with a middle lap belt but I recently saw one and at a glance appeared only to be two rear seat belts with no middle lap belt unless the middle lap belt was tucked away under / behind the seat. Can somebody that knows please clarify this for me. Also do all 1986 560 SEL have a front drivers only airbag ? Lastly, is there a go to online source for replacement parts for these cars if so what is it ?

Thanks in advance.