Please satisfy my curiosity. Why would someone spend $50+ for the Jo-Han kit, or even twenty bucks for the Revell kits, just to get the beacon and/or siren when suitable resin parts are available for a reasonable price? I'm basing this question on the realistic possibility that someone needing those parts might have absolutely no interest in the kits themselves. Sure, you can sell or trade the kits minus those parts; but, that can be a PITA. Using the Jo-Han kit as an example, if someone was looking for that kit specifically to build a 60's-era patrol car, he probably would pass on buying/trading for it just because it is missing those parts. Obtaining the kit would still mean he'd have to find and buy a replacement siren and beacon. Not every modeler is a member, or even visits, forums such as this or is aware of aftermarket companies which make these parts.