I guess it is worth what you would be happy to receive for it. They are the sort of part that is somewhat fragile and not suitable behind high torque developing engines. Being for the H145 they are tiny little hemispheres. Hard launches and very wide sticky tyres will break them. The part that lets go is the inner housing that holds the clutch packs and the sides gears locate on. In particular the section where the pin goes through can crack. They are a top piece of kit if they are looked after. Replacement clutch packs are all but NLA on this side of the world, are they available in the US?

They would be the perfect part for maybe historic classes, say 1300 class.

Due to there rarity, upwards towards ~$1000 would be on the money imo, possibly more considering what the famous twin outlet GX exhaust manifold is selling for these days. Personally Tom, I would sell it on the condition that you are offered 1st chance to buy it back if it was to resold again incase you don't like the H190 due to the extra un-sprung weight. Are you changing due to a different ratio?

cheers
benny