Try one of these sources. Select the OEM catalog and enter the year, make, and model. What you are looking for is under Hood and Grille, then worm your way to the insulator.
Dodge Parts Online Parts & Accessories Catalog
Genuine OEM Parts Catalog for Dodge, Chrysler, Jeep and Plymouth
Mopar Parts for Dodge, Chrysler and Jeep: MoparPartsAmerica
Prices vary ever so slightly among them - shipping may be an issue on something of that size though. Find the one closest to you and you may save a few bucks. I have had good luck with all three.
BJ
Here is a screenshot from the dodgeparts.com site:
<TABLE class=tabletext cellSpacing=0 cellPadding=3 width="100%" align=center border=0><TBODY><TR><TD class=tabletext style="BORDER-TOP: #a52021 4px double; BORDER-BOTTOM: #a52021 4px double">
Description</TD><TD class=tabletext style="BORDER-TOP: #a52021 4px double; BORDER-BOTTOM: #a52021 4px double" align=middle>
Year</TD><TD class=tabletext style="BORDER-TOP: #a52021 4px double; BORDER-BOTTOM: #a52021 4px double" noWrap align=right>
MSRP Price</TD><TD class=tabletext style="BORDER-TOP: #a52021 4px double; BORDER-BOTTOM: #a52021 4px double" noWrap align=right>
Core Price</TD><TD class=tabletext style="BORDER-TOP: #a52021 4px double; BORDER-BOTTOM: #a52021 4px double" noWrap align=right>
Your Price</TD></TR><TR><TD class=tabletext style="BORDER-TOP: #a52021 4px double" vAlign=top>Insulator
</TD><TD class=tabletext style="BORDER-TOP: #a52021 4px double" vAlign=top noWrap align=middle>99-02 </TD><TD class=tabletext style="BORDER-TOP: #a52021 4px double" vAlign=top align=right>$75. 35</TD><TD class=tabletext style="BORDER-TOP: #a52021 4px double" vAlign=top align=right> </TD><TD class=tabletext style="BORDER-TOP: #a52021 4px double" vAlign=top align=right>
$54. 24 </TD></TR><TR><TD class=tabletext style="BORDER-BOTTOM: #a52021 4px double" colSpan=5><TABLE cellSpacing=0 cellPadding=0 width="100%" border=0><TBODY><TR><TD class=tabletext></TD><TD class=tabletext noWrap> </TD><TD class=tabletext noWrap align=right>- - </TD></TR></TBODY></TABLE></TD></TR><TR><TD class=tabletext style="BORDER-TOP: #a52021 4px double" vAlign=top>Retainer
</TD><TD class=tabletext style="BORDER-TOP: #a52021 4px double" vAlign=top noWrap align=middle>94-02 </TD><TD class=tabletext style="BORDER-TOP: #a52021 4px double" vAlign=top align=right>$3. 55</TD><TD class=tabletext style="BORDER-TOP: #a52021 4px double" vAlign=top align=right> </TD><TD class=tabletext style="BORDER-TOP: #a52021 4px double" vAlign=top align=right>
$2. 52 </TD></TR><TR><TD class=tabletext style="BORDER-BOTTOM: #a52021 4px double" colSpan=5><TABLE cellSpacing=0 cellPadding=0 width="100%" border=0><TBODY><TR><TD class=tabletext></TD><TD class=tabletext noWrap> </TD><TD class=tabletext noWrap align=right>- - </TD></TR></TBODY></TABLE></TD></TR><TR><TD class=tabletext align=middle colSpan=5><!-- CFX_IMAGE v. 1. 1 Jukka Manner 1999 -->
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</TD></TR></TBODY></TABLE>