Semco Replacement

HI there. The plastic cam in our window lock broke. Our house was built in 1999, and the window hardware says Semco. This piece is the lower part in a tandem casement sash lock. I was wondering about a replacement for it. I was also wondering if we'd need to replace anything else... the top part of the tandem looks like it works just fine.

I think Product Code: 38-144 is the replacement (as the measurements are the same), but I wanted to get your expert advice before I order.

Many thanks!