Plain bolts, no washers Demi. The issue with the original bolts are the flanges that stick out beyond the bolt head (not the type of fastener, just to be clear). They can contact raised edges on the cover and keep the cover from centering properly (even though the cover has two location pins).
Jeff
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'18 GG XC 300
'05 GG DE 300
'01 GG txt 321
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