I have called dealers about various implements etc. when I tell them I have a B2900 they say NO it's an L2900. I may be old but my tractor clearly says B2900 on the side. When I google B2900 I find very very little information and most refer to the L2900. What is the difference between these two models? I also want a tiller for this tractor and need advice for the appropriate size for this model. Thank for any assistance.