B7000 rops

I'm a newbie with a first tractor, new to me, B7000 4WD with loader and box blade on 3pt hitch. I pick it up on Wednesday morning so am not equipped with serial numbers, etc. But, I'd like to know what ROPS would fit my tractor so I can try to take advantage of the Kubota deal at cost. I see a problem: The form asks for the serial number so that would seem to be a dead giveaway and eliminate the opportunity to come in with some non-gray model. Am I missing something there? I've read a lot of articles and posts, watched videos and so have some pretty good idea where I am. First I will change all fluids. My thought is Rotella synthetic 5w-40 in the engine and Mobil synthetic 75w-90 in the transmission as hydraulic oil. OK??? I'd appreciate info and will be back with specifics on my tractor on Wednesday.

Thanks for the quick reply, Vic. I thought I'd seen that the 7100 rops was no longer available. At any rate, how would I take advantage of the Kubota offer of a low cost rops if I can't identify my tractor as a B7000. The application form for the rops deal, which I have seen, requires a tractor model and serial number. Also, does the use of mobil synthetic 75w-90 seem OK with the front end loader?

Well I have a little more. I found a tractor serial number B7000 40606 on the side of the transmission - left side from the driver's seat - and a casting N5 91 C on the same side of the top of the head. I haven't found the engine number yet. The loader appears to be an Aim high Loader Model S, whatever that is. I'm a new owner - just arrived home 2 hours ago. More to follow. Thanks.