I know someone will be interested in the following link to the photo of a Brabham FJr. I am not a Brabham expert, but I suppose it is either a Bt2 or BT6. It does have the same 4-spoke wobbly wheels I have. Photo was from Lyndale Farm course near Chicago in 1965. The track is no longer in operation.
http://mcsccpix.homestead.com/65_13.html
Roger