This aerobat 150/150 1976 M model with the flat gear spring conversion is for sale on the Chartis aviation insurance auction web site (ending may 18) airplane is in Tenesee, and it as some hail damage, 3286 TTAF, 1286 SMOH :
[
Linked Image]
edit: looking at all the pictures on top of the wings, the actual gas cap location is odd, compared to OEM tank cover, so I would be tempted to say it has modified long range tank ?