Previous 912 owner info needed

Who can help me further? I am looking for one of the previous owners of my Porsche 912 BY65 MY 66.
My 912 is fairly well documented. But I still miss some info. I am looking for Steven Peter Jackson, Address 124 N. Grand, Maryville, MO 64465 Drivers license n °: as i can read: 9012-9082-0490-8416 Birthday: 6-19-59 IDD: 044630
he owned it from 1984 to 1986. Then the car was sold to Mr Pollman. But I cannot find the exact sale date. I have already contacted Mr Pollman and this man verbally confirmed to me that he bought the car from Mr Jackson in 1986. But I have no hard evidence

Maybe someone can help me further.
Thanks in advance

Gunbab, although there are participants on this forum who might be able to help you, I suggest you also try the 912 enthusiasts group: https://www.912bbs.org/forum/ There are many members of that forum who also reside in Europe, some in Belgium. I presume you have tried to contact Mr. Jackson directly, and have used the various "people" search programs to do so.