are Ef - El upper control arms compatible with my Eb ...
the look a hole lot stronger then my pressed metal Eb ones
i have a set here i got from the wreckers last year..?

EF and EL have different lengths and shapes for different models.

EFXR and EF11 Fairmont Ghia had tickford spec specific arms compared to the other EF models, but are all the same length, and some can be used in your EB. Some of the EF tickford arms had specific upper arm mounts that you would also need to fit to your EB to make them work.

ELXR and Fairmont Ghia had tickford spec specific arms and are 20 mm longer compared to the other EL models, and only the tickford spec arms can be used in your EB without running an EL diff in your EB.

I hope that is perfectly clear.

Cheers
BenJ

Ask Papa Smurf for part numbers to confirm any differences in parts from EF/EL, as well as XR variants.