R107 gen 2 upper ball joint compatibility

[rwd4evr]

I'm getting near time to rebuild/modify/improve the frontend in my 450slc drift car. I'm going with 560sl spindles and lower control arms for a few reasons.
1. The brakes are in the rear of the axle and I'll have more clearance with the front of the upper control arm.
2. The bigger r129 brakes I'm using push the caliper further away from axle center line for additional clearance at full lock
3. The brakes are pushed further out from the vehicle center line which is another win for clearance for increased steering angle.
4. The lower ball joint is a straight shank with clamp in the spindle so I can use a custom stud and mono ball lower ball joint with spacers to adjust the roll center without having to cut a taper and threads on it.

I'm extending the control arms 40-50mm per side for more inner fender/frame/subframe/swaybar clearance. I have the parts here but I have not dragged the donor 560 SL into the shop to pull it apart yet and I'm wondering if the upper ball joint stud is interchangeable between the Gen 1 and the Gen 2 spindles. Meaning can I use a bolt on gen 1 upper ball joint in the Gen 2 upper ball joint hole in the spindle? This will save me a bunch of trouble since I can just build a completely fabricated upper control arm using the correct bolt on Mercedes ball joint rather than cutting and extending the forged gen 2 upper control arm which is a non replaceable ball joint.

Sent from my SM-G991U using Tapatalk