I think you are just going to have to add what you need to the regular fixture. If someone is selling a 24in version it does not come from aquaticlife that way. They are just adding the parts and shipping together.
I’m referring to the hybrid fixture they sell. There are additional pieces available from their site to adjust the width to 24”. Instead of purchasing the regular version then all of the brackets needed to increase the width to 24”, I’m hoping to start with the 24” (and hopefully save some unneeded pieces and cash)
We can try to help out. It would need to be purchased directly from us and to be honest we do not compete or have sale pricing like our resellers, so it would be at suggested retail. May save some money but it may not if the reseller has them on sale.
Let us know what your looking to order, will be glad to try and help.