I have the old style BEGI or FM intercooler. It has the top and bottom tanks, and it came off my '99 miata. May fit other years. It measures 16 5/8" wide by 8" high on the core, overall height is about 12.5". Selling only because I got the new style FM intercooler with the side tanks. I just dyno'd at 225whp with this I/C on 12psi.
I have no idea what it's worth, so make me an offer.
I also have an oil cooler that I used a long time ago as a pre turbo oil cooler for some reason. It measures about 5" by 10" core and it uses -6AN fittings. I will include the fittings I used and the line. I used (2) -6AN to -4AN adapters, (1) -4AN 90* elbow, (1) -4AN straight fitting, and the line itself is -4 and is about 3' long.
I also have no idea of the value, maybe $40 after you calculate the hose and the fittings? Make me an offer.
This is the last generation of that intercooler design by Begi. It's the best one of that series. All aluminum, more fins and better mount tabs. Also the design is near perfect as far as intercoolers go. It's cross flow and the tanks are north/south which creates a large area for the core to see air.