Here are some pics of my RT-700 that I bought 3-4 years ago. The front shelf with brackets were optional at the time. I’m glad I got it.
There’s a couple of shots of the outside of each bracket with the shelf down and then an inside/underneath shot of each bracket with the shelf up.
Sorry I don’t have part numbers but at least you’ll know what the stock brackets look like.
I’m not 100% sure which newer models are identical to the 700. I thought the 1100 and the 1250 were the same frame & body but with additional shelves…and I think the front shelf is standard now,
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