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Try here for the foams - http://www.ebay.ca/itm/Replacement-foam-for-2-Altec-Lansing-model-19-horns-/321894678516?hash=item4af26afff4:g:rcoAAOxyUgtTKJVT

also foams for the Valencia 846B -...

The Darsts no longer offer the foams but there is a seller on Ebay who sells foams for the horns on the 19's and the 846B Valencias....

Foam inserts can be found here on ebay. http://www.ebay.com/itm/Replacement-foam-for-Altec-Lansing-19-horns-/321368109697?pt=Speakers_Subwoofers&hash=item4ad3083281

For foam inserts go to Canuckaudiomart here http://www.canuckaudiomart.com/details/649071316-replacement_foam_for_altec_19_horns/