I don't know the XC90 well but if its the same mount style as the P2, starting in about 1999, you probably have to loosen the top mount bolts to make sure the bottom ones get seated right into the engine mount. Both those bolt heads should go flush to the AC compressor frame, correct I think that is...

Is it possible that there are the thread remnants of a broken screw in the hole, not allowing the screw to fully seat? You could measure the hole depth with a piece of wire or similar, then measure the length of the screw to see if it matches.

Hi Rick - where is the Auto Parts Market? I wouldn't mind checking it out. Shenzhen Sungang Auto Parts Market 深圳市笋岗汽配市场 260 Taoyuan Rd, Sun Gang, Luohu Qu, Shenzhen Shi, Guangdong Sheng, China 广东省深圳市罗湖区笋岗桃园路260号 Go about 4 block west on Taoyuan Rd. There is another. Bagualing Auto Parts Market Two ...