I have a bonnet from a '58 or '59 Jaguar XK150 Roadster in my dad's basement that I want to sell at some point. Also have two grills somewhere. How do I find out what something like that is worth? It looks like it's in good condition other than paint ... smooth and straight. My dad bought it 30+ years ago when he was rebuilding a XK150 drophead Coupe (I wish he still had THAT) and it didn't fit (roadster had a longer hood) so he never used it at all. Looks like something that could be of value to someone. Anyone know what I could ask for it, or where I could find out something like that?

__________________
1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)