Matey,
Try Halfords. Its a 10mm deep drive socket you need
Just get a 1/4 drive as it will be cheapest
They should sell the strips too, but to be fair you dont need it, the best idea might be to use a blob of silicon when fitting it.
But, remember that when you lift off your existing wing there will be little rubber seals that you can use.
You dont need to drill any holes to fit the new one, so there should be enough of the old seals to get you home and dry
Gimme a shout if you need a hand.
P.s remember to feed the loom for the light down through the hole and check its free before you bolt the new wing down tight
J