Djm makes tubular upper arms meant for lowered vehicles. You can buy them from here as one suggestion:
Suspension | Product categories | SCG Inc.
DSP is another great vendor,
Suspension - Driven Speed Performance
Tubular lowers exist currently only for the RWD platform. AWD coming soon. It requires you to move to full coilovers upfront from the likes of QA1, afco or Viking. Any 19” end to end coilover will work…. They are made by a shop in California. Oscar something, I don’t recall his name, but he is in the various Facebook groups for the tbss. Cost is around $900 for the lowers alone and you still need to buy the coilovers.
the belltech lowering kit is by far the best budget system to lower the tbss. For around $1000 bucks you can get a front and rear shock and springs with upper front arm. You’ll need a new upper ball joint