Radir has a 8.30-15 that is listed as 29" tall. Coker has a 8.20-15 that is listed as 30.5" tall, and a 900-15 that back-calculates to 29.1".
I tried to find one using the numbers in correct order, width, height then wheel size. It will help in the search! I wasn't able to find anything to match your specs. Most stuff 8 wide is only 26 tall, most stuff 29 tall is 10 wide. @chickenridgerods has the closest ones posted.