Copper Washers for ATM Cooler Hollow Bolt

[LA280SL]

I recently replaced the ATM fluid pan gasket and removed the hollow bolt and two copper washers that connect the hard line from the transmission cooler.

To reinstall this hollow bolt (located between the converter and fluid pan), should I replace the copper washers or use existing washers?  If not, would it be wise to first apply a sealant to the surfaces of existing copper washers? 

I appreciate the feedback.

[LA280SL]

Here is a photo of the bolt and washers.

[Pawel66]

Replace.

[LA280SL]

Thanks Pawel.  Will do. 

[Benz Dr.]

Use aluminum seals which are softer and seal better.

[Pawel66]

They are available from Mercedes for peanuts, but then sometimes you get copper, sometimes aluminium.

In any hardware store you should be able to get proper diameter aluminium ones.