2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010
Just about any tractor dealer should have some or be able to order them. I picked up a few for spares from my LS dealer for $5 each that were like the ones you need. That was likely a bargain but he had about 40 of them so he was glad to get rid of some.