Which one fits an MI?

Only Product B lists the MI. Product A lists M, MC and MT only, so pick B for an MI.

Are they the same part?

They are close. Both replace AM1956T and AM476T, but B also lists the M359T latch number and the MI model.

Which is better made?

Both are aftermarket. A states steel construction; B states USA-made origin. Neither listing gives steel gauge or a warranty.

Do I need the latch too?

B includes the latch (M359T, M360T). A's listing does not name the latch separately, so confirm with the seller if your latch is worn.

Is one worth the extra?

Only if B's price premium is small. You pay for MI fit, USA origin and the included latch; otherwise the parts overlap heavily.

Will shipping cost more?

Likely yes for both. A charges oversize and handling fees; B gives no combined shipping discount on seats.

Tractor Seat Frame & Cushions Fits John Deere M MI MT MC Tractor AM1956T, AM476T vs JDS379ASY New Seat Frame Assembly Fits John Deere M MT MC & MI

Both are aftermarket seat frame assemblies for the John Deere M, MC, MI and MT, built from the same OEM part numbers. Product B covers the MI as well and is listed as USA made; Product A lists only M, MC and MT. No prices were provided for either, so check current store prices on this page before deciding. Buy B if you own an MI or want the wider model fit; buy A if your tractor is an M, MC or MT and its price is lower.

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