I am not familiar with any other MFG parts that will interchange with Moen.
Rather than replacing the divererter have you considered reconditioning the one you have. Normally it is not difficult to do.
Moen is a well respected name in the Plumbing trade and normally nearly all commercial plumbing supply houses will have a full line of parts or can get them almost overnite.
You might try their Website dealer locator to find a dealer near you.
www.Moen.com
or you could contact them direct for a parts catalog or customer support.
Moen Incorporated
25300 Al Moen Drive
North Olmstead, Ohio
44070-8022
USA
PH. 1-800-848-6636
FAX 1-800-848-6636