Bilstein struts & rear dampers

Looking for clarification here - there are a number of different Porsche part numbers listed for front Bilstein struts used on 911's from 1971:

911 341 943/4 00 ('71-'72)

911 341 041/2 33 ('73)

911 341 079/80 36 ('74-'76)

911 341 041/2 30 ('74-'76) 'Sport' ?

911 341 041/2 31 ('77-)

What are the differences between these struts ?

Are they interchangeable ?

My '69E (originally fitted with hydropneumatic front struts) currently has Koni front struts (with alloy 'S' calipers) & rear shockers - would there be any (significant) advantage in swapping to Bilsteins ?

I know that the rear suspension was modified at some point (1972/3?) to alter the angle of the shocks & again around '76 (?) when I think the lower mount was changed to a smaller size.

Does anyone know if all pre-'76 rear shocks will fit my '69 model or are there differences ?

Andy,

I don't know off the top of my head the differences, I could check in my reference material if you really need the specifics. I have been VERY happy with the Bilsteins I installed on my car almost 20 years and 155,000 miles ago. VERY hard driving and still going strong. Porsche has used Bilsteins for a reason on all of its high performance cars.
Hope this helps.

All the best!

Roger Grago
PORSCHE Newport Beach
R Gruppe #27
73 RS-T
70 2.4MFI VW Bus

As far as I am aware all the different struts are interchangeable. Ask Jim Avis, as he mixes and matches all the time.