Not sure what these are to or originally for, hence its placement here... I'd guess it's for an FC of some sort (maybe Swift? Diemen?) but I don't know. I'd be happy to move it to a more appropriate sub-forum if necessary.
23&3/8ths x 17&3/8ths overall size.
Upper element has pre-drilled holes, approximately 7.25" center to center (not exact but close). The location for the upper element has a relief (i.e. no core) that is appx. 10.5 x 3.75", the lower element relief is appx. 6 x 2". The pair weigh 4 pounds.
I would be happy for $70 for the pair, shipped.