I had an older Bobcat 909 backhoe I mated to my T300. I used the factory "ball mounts" from earlier units as the pre-drilled holes were still present in the later models, even my T300. The 8811 mounts in a similar fashion, but instead of ball mounts they used a "hook and grab" style rigid mount. If I remember correctly, the CTL mounted grab pieces are bolted in the same place beside the cab steps. You should have holes there, probably with black plastic fillers. I'm pretty sure you can get the parts at your Bobcat dealer.
These photos should give you some hints to what it looks like. I'm not sure if you already have the 8811 or just contemplating buying it.
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If you want to attempt building something, you can reference these pictures.
2018 BOBCAT 8811 Backhoe Attachment Mounting Kit for 8811 UNUSED - $549.00. FOR SALE! Bobcat Backhoe mounting Kit Set 2018 Brand New/Unused 8811 Original Bobcat Part NO EXCHANGES ALL SALES ARE FINAL Local pick-up from Miami, 33016 Local pick-up from Miami, 33016 ALL SALES ARE FINAL - NO RETURNS...
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I certainly wouldn't pay $549!