I have 99 suburban and need inside speakers but don't know the size or shape

What size engine do you have in your Suburban?

About 99% of them had the 5.7 liter V-8 engine with 255 horsepower.

Approximately 1% had the 6.5 liter turbo-diesel with 190 horsepower.

The 2500 suburban has an option for a 7.4 liter gasoline engine with 290 horsepower.

This is a Dealer item it will be the only place to get a new hose.

if you have a wiring guide for your deck, take a look at it and see what your rear speaker + and -'s are, connect them accordingly to the wiring guide in the link and your speakers should work, if not, the wires running to the speakers are probably damaged. if thats the case, go to a dollar store and pick up some speaker wire, and run it under your panels, or carpet, what ever is easier for the particular make.

do not need to bypass. as i said just connect the turn on lead at the factory harness to the amp control wire on the radio

Find a blue wire on the wire harness to the truck and connect from the blue white on the radio. this will turn on the factory amp that runs the rear door speakers

You can go to crutchfield.com to input your vehicles specific information and they will tell you what size speakers you need for different locations.

i belive the are around a 6 inch speaker tale out ur original speakers and measer across the speaker or if they are the crazy looking shape then i would take the original speaker down to the store u are going to and ask someone to help u find the shape and size

the 99 suburbans have a factory amp to run the rear speakers bypass this amp or replace it.

According to Crutchfield.com, you have 6 3/4" speakers in the front and rear doors, 4"x10" in the rear pillars. The 6 3/4" locations should be able to fit 6 1/2" and 5 1/4" speakers using adapters. I would imagine the same could be said for using 6"x9" speakers in the 4"x10" pillar locations.