The spindles look just like my 86 spindles. I have no idea what the spindles for a 87 look like so can't comment on if they are 87's.
I would say your lower arms are +2, but the upper arms are +1. I am guessing you bought these used. maybe the seller had a set of +2 and +1 arms and got them mixed up? Post up some measurements and I am sure someone can compare.
Doug
2004 TRX450R, 2008 TRX700XX
(BITD #639 Quad Ironman Expert)
2013 sponsors: Teixeiratech.com, Motowoz.com, Dirttricks.com, Snailmotorsports.com, My bank account.
2008 TRX700XX
2005 TRX450R
1986 TRX250R