This full set of wheels is $125 near me, I think they came off an early 740. Part number is 70156 but haven't seen a name for them.

I think they'd look great on my 240 but haven't found any pics of them on one to help visualize. 14" and same tire dimensions as stock wheels so I assume they'll swap straight on.

 

Just by them if they are $125 for the set. For that price if you don't like them you can resell them.

 

wheel-size.com is a good resource to compare factory rim specs between your car and the 740 donor. My expectation is they should fit just fine.

 

center bore might be different on a 240