roller rocker arms

Haveing a crisis!!!!!!!!!!! I have a '92 Lt 1 and just installed gm roller rockers. Who makes valve covers that will clear these rockers and still clear my alternator?

one question??? did you not know they were taller???? b4 or after you installed them
http://www.gmpartsdirect.com/performance_parts/store/catalog/Category.jhtmlCATID=777.html
 
http://www.jegs.com/webapp/wcs/stores/servlet/KeywordSearchCmd?storeId=10001&catalogId=10002&langId=-1&N=0&Ntt=lt1+valve+covers&Ntk=all&Nty=1&D=lt1+valve+covers&Ntx=mode%2Bmatchall&Dx=mode%2Bmatchall&searchTerm=lt1+valve+covers
^^^^ this one has them for sure^^^^