Never seen just a lens come up, so:
https://www.ebay.com/itm/1969-1970-Pontiac-Catalina-Instrument-Cluster-Lens/153326048958?hash=item23b2f1d6be:g:haAAAOSwHjNV~A5n:sc:USPSPriority!98074!US!-1:rk:24:pf:0&vxp=mtr