The water pump I installed in my car came with a gasket, but no O ring, and there was no O ring on the water pump I removed. Is the O ring necessary. If it is, I guess I will be doing the job again......Thanks.......Mike

 

Mine came with a stamped steel 'gasket', no 'O' ring. The thermostat has a split rubber seal that goes around the edge.

 

This is what mine came with, but SNG Barratt shows 2 sizes of O rings also. After all the trouble I went through finding this engine, I don't want to screw the pooch, and burn this one up. It has no leaks.......Mike

 

this is what came off my 03, will fit your car, this is what I put back on it.

http://www.ebay.com/itm/Engine-Water...ZW9orJ&vxp=mtr