Kn;
I measured the original bimini for the 23.5. The forum store orders from them and like Kermit said, it sure helps during the summer months. The original color was Persian Green but for what it is worth, the material or sunbrella gets hot underneath it during the hot summer months so I suggest that you get a light color. In addition there is a four and 6 foot length bimini and may I suggest the 6 footer. You will need to move the boom bail forward for attachment of the mainsheet but that does not affect the performance. There are instructions generally provided. The drawback is you cannot stand under it as you will be sitting down.