rear deck speaker bracket for an echo...?

[bam22056]

i just got a couple speakers from a friend who cant fit them in his car (they are the 6x9 [i believe] rear deck speakers), and i want to put them in mine. the only problem is that the speaker bracket for the factory speakers is this strange triangular shape, the the speakers i have don't have a bracket on them, and jst screw in with 4 holes going around the edges. any idea how i can get around to installing these speakers in the rear deck?

[RningOnFumes]

Ebay often has adapters for many makes, try searching them.

[denman]

Home Depot and CTC have angle iron rails with holes in various shapes that will get you there. How do the connectors look for compatibility?