JBL 5235 crossover for JBL 4343 blue baffle studio monitor speakers. Might fit 4344 and 4345, but I can't remember their crossover frequency point. This has the 4343 Hi/Lo cards inside, which I believe cross at 300Hz.   Tested and known good.  The pigtails were made by a friend and are not guaranteed as they're quite fragile, but worked great for me.