Trailing Arm differences ?
 

Are the trailing arms (bananas) interchangable between 911 models ?
Do the aluminum trailing arms fit in any 911 / 912 ?

I know the turbos have different geometry/bearing housings. I think the aluminum ones fit the early models though, but I could be wrong.

I swapped mine from steel to aluminum. At the same time I put in Elephant monoballs, Wevo SPS components, and Smart ARBs on Wevo ARB mounts, so I can't say how the fit is to stock components in that regard, but, as those parts are all designed to mount to stock unmodified cars, I'd think there should be no problems interchanging them.

yes, but what you need to do varies with how early your car is

Sherwood has worked it all out on his web site (at least for LWB cars)

what year is yours?

The Aluminum arms fit on 72-> cars. The 69-71 rear crossmember means the rear dampers do not fit right with Aluminum arms. The SWB cars cannot use anything but original SWB arms or some sort of custom one using a Turbo, otherwise the rest of the suspension must be swapped and the car converted to LWB with the according fender modifications. Turbo arms are similar in geometry to the shortened RSR steel arms and to the SWB arms but are beefier. They will not work right on a LWB model but can be made to fit on a SWB as I understand.

No, you can mod. so the Al arms fit cars back to '69.

I've seen pics of SWB cars altered (via major surgery) to use Al arms also. Not sure if that was here or on Early911S bbs.

Must have been Aluminum Turbo arms if they still had SWB.

The Alu arms need mods to fit 69-71, they work, but you will encounter scraping of the damper against heat exchangers according to some or scraping of the dust cover on the shock tower.