Does not fit glock 21sf as stated in op info - Crimson Trace Light Guard, All Compact and Full Size, Fits Glocks

I purchased one of these for my G17 and it fit perfectly! The whole system provides intuitive control. My wife really liked it (the G17 is hers). So I thought I would get one for my G21SF. The Optics Planet description clearly states that the LTG-736 is compatible with the 21SF. NOT SO. I cannot get this thing to fit my 21SF. Further, the CTC website and packaging does not list the 21SF (or the 20SF) as compatible. In addition, the comments on Amazon.com have many unhappy 21SF owners who have tried and failed to use the LTG-736 on their 21SF's. Come on CTC!!! you can't squeeze one more SKU into your inventory and make an LTG for 20 and 21 SF owners????