Foglight and High beam lense replacement

[mikell]

Use silicone seal adhesive - any hardware store will have it.

[RallyD]

i did all 4 on wifey's 530 and one high beam on my 525
on mine i used an old lens from the 530 to match the vintage and used all new plastic lenses on the 530. For the 530 I removed the assembly and used a product called Marine Goop. It was a little thin and runny but filled all the void and there is no moisture entering and the lenses haven't fallen off.
On the 525 i just used clear silicone with the lamp still on the car.
Make sure you clean out the groove well to remove the old seal and you'll be fine.