There is a guy that sells a fork brace on ebay for a Kawasaki ZRX that can be slightly modified to work on a TB. I have had one on my 95 TB for the past couple years. To be honest, I don't know how much the fork brace is helping. I made a number of changes to the front end at the same time so I'm not sure of the benefits of the fork brace. I don't know if this would work on a TBS.
Warning, While I like it and it fits, I'll be honest, it's not 100% useful. I had to slot the rear bolt holes on it as while the spacing between forks is dead on (the 43mm diameter is not really a factor here as it bolts into the holes used by the now removed fender). So while the side to side is perfect, the fore and aft, is not. This is where the 43mm comes into play. The spacing fore and aft for our forks is more then the spacing on the Bonnies. You can sort of see what I'm talking about in this pic
The fork brace does not extend far enough back for our bikes. That being said, after slotting the rear mount holes and using large washers, I've had no issues and it stayed intact during my high siding of my t-bird a few months ago. I reused the stock cable/brake hose keeper on the left side (there's a mount hole for it already).
Lastly, it may be possible to re-use the front fender, but I trashed mine long before I installed the brace, so I can't help you there. I'm interested in GJBushman's comment about the ZRX brace? Might have to look into that.
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