I want to upgrade all rear bulbs to LEDs

any probs with this ?

If you're meaning to get an LED light unit for the rear then it's no problem. Fordie on here has done just that:

Shouldn't be a problem though you may get bulb outage warning on the cluster if it's a facelift because the LEDs don't draw as much current so the GEM thinks the bulb has blown.
I think it depends on the type of LED you buy though, try it and see

nope. I mean like are they a BA15 figment for all 4 pairs of lights ?

I know you mean bulbs, they are standard bulb fitments.
Offset pins for indicators but take note of my post again.
Can you get LED stop/tail bulbs then? I can't see what the benefit would be behind the red lens as you can't see the bulbs can you?

You can get these but dont they are pants last 5 mins and are not as bright as standard they are direcetional and dont utilise the rear reflector in the light...