As you probably know, the stock Silhouette wheels have five circular openings in them. I found some wheels in the parts box that have six holes in them. I don't know what they go to, but they just didn't look right. I don't have a Boomerang or Rainbow. My last auction find included the Silhouette and Jota, Ferrari 250 GTO, 512S, Testarossa, 288 GTO metal kit, Porsche 924, two 1/12 F1 kits, and a 1/25 F1 kit. I can tell you like exotics, I love the way you chop them up and make something totally new.