TOPAZ is owned by the Shanghai Tongzhi Auto Parts Co., Ltd.

They are an aftermarket parts distributor. They source parts from many unaffiliated manufacturers, almost all Chinese.

They are likely not an OEM provider of much of anything

They are like a Rein in that they make little on their own.

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'03 530i - manual swapped - 425k miles
'06 325Cic auto 115k
'05 X5 3.0 auto 158k
'99 E39 528i 5-speed 130k