E36 adjustable rear control arms
 

There are two types

Type 1 (one) is a standard adjustable arm. +3 to -1
Solid steel construction. 225$

Type 2 (two) is an aluminum arm. +3 to -1
Aluminum construction light weight. 315$

Made by Eibach/SPC

Are the rubber bushings replaceable on either one?

Just from looking at it on my work bench I'd say yes, but let me call eibach and double check it with them.

I assume they are oem bushings? Maybe when you call you can confirm.

Called eibach. Yes indeed the bushings can be changed. There is a kit availible from eibach/spc or oem can be used, but eibach recomends buying their kit... Of course.

How critical is the extra weight of the steel arm? From what I gather, they are heavier than the stock arms? Would you be able to get pricing on the TMS (rubber bushing) arms? I think they go for $300 USD, might be able to get a discount in bulk.

Also, where are the Eibach/SPC units made? USA?

Eibach is american made yes. They are a decent quality producer.
I'd rate their products as street/track, meaning that they are not
entirely race oriented. The weight will be a touch more than the stock
Arms, but in a lot of aplications weight reduction isnt the goal. If you're a competative racer then perhaps tms or some other arm is a better choice. If you want to improve the strength and adjustability of your rear camber than these kits are perfect!

I've got the aluminium ones and they're great - easily adjustable.

FYI i think you have your adjustment specs wrong - should be -3 to +1... not the other way around ;)

Great price too! - Look BW to compare:
http://store.bimmerworld.com/adjusta...46z4-p663.aspx

GLWS!