How about the JS-120 from JBL that are for their L-100 Classic speakers? Note they’d only save you around $50. Yes, look at Etsy. Or if you are handy and have woodworking equipment you could make some from wood that would do the job just fine. Keep that 5° slant and the same distance from the floor to the woofer and you'd be set. (Figure they are using 1st reflections to enhance the bass maybe of the KLH Model 5).
Is there a cheaper alternative to this:
5° Slant Riser Base For Model Five (klhaudio.com)? either wood or steel, or whatever. doesn't matter, really. thanks in advance.