We have a 92 chevy blazer K1500 4X4, want to relpace the PCV valve but can't find the old one! Any help would be appreciated

Here's what it looks like and costs:

AutoZone.com | Vehicle Selection | Year (http://www.autozone.com/autozone/catalog/parts/partsShelf.jsp?categoryDisplayName=Routine+Mainten ance&fromType=parts&fromString=search&parentId=cat10003&currentPage=1&filterByKeyWord=pcv+valve&isSearchByPartNumber=false&navValue=14200541&categoryNValue=14299999&fromWhere=&itemId=prod10823&displayName=PCV+Valve&searchText=pcv+valve)