Are all TQ phenolic(black) spacers the same??

there are differences between them, obviously 800 to 850cfm. just have to eyeball them closely. i have used this seal all to glue the wells and it hold you could try it on the cracks if they are minor [ame="http://www.ebay.com/itm/like/170724345216?lpid=82"]3 Lot 2 oz Seal All Purpose Adhesive Sealant Glue 380112 Fast Drying Clear New | eBay[/ame]