can someone help as i need a new top 4 my '92 conv.??? how does 1 know if a new top is needed? what are the cheapest,decent tops and where can one purchase them?? how much is reasonable 4 a new top and installation?? i got a quote 4 $1,100 out-the-door 4 an aftermarket??? any suggestions??? ps my rear window is in bad need of replacement as it has a 16" x 3" crack in it?? many thanks.