According to those measurements 10.5" rim = 266.7mm /2 = 133.35mm to make a 0 offset.
5.5" from the front = 139.7mm which = -6.35mm offset
9.5" rim = 241.3mm /2 = 120.65mm to make a 0 offset.
5" from the front = 127mm which is a -6.35mm offset
Since Wedsport only makes a 10" +18 or +36mm and a 9" +20 or +36 rim and there are no stickers, Im wondering if knockoff. Unless they were measured incorrectly or I misscalculated. Their website warns of many replicas on the market.
WedsSport Brand Site | WedsSport SA55M | weds CO., LTD.
Can you provide more close up pics or the wheels?