I would thread in a loop of wire at each corner (or near to) and use that to pull up. Usually the grill is crimped to make it wedge into a groove. (OK that is how mine all came out - several other brands of speaker)
Good - Fast - Cheap: Pick any two.
3 x E32 735iL (Alpine White, Glacier Blue & Kashmir Beige); 2 X E38 735iL (Oxford Green & Alpine White); E53 X5; R50 Cooper; R55 Cooper Clubman.
E38 Parts Car
E21 318i; E23 735i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
I've just changed my wiper blades and now my reverse lights don't work. Should I change my fuel pump relay?