Here are photos of the drive heads for these two mowers from the operator manuals
Looks like your mower is the MF41. You can tell by the attachment clevis for the chain. It's a weldment for the MF41 and a casting for the MF31.
Here's my MF31 sicklebar on my Mahindra 5525
Manuals: try eBay and manuals.us
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