I have used this one on a few Traditions/CVA rifles;
https://www.trackofthewolf.com/Categories/PartDetail.aspx/882/1/RS-LA
It is set up for a 3/8 dove tail and will not "drop in",, 3/8 is too wide for the metric dove on the spanish rifles. I've found opening the barrel dove tail with a tri-corner file to be easier with a cleaner look than trying to remove material from the sight itself,, it comes a little raw and needs to be polished for whatever finish you choose. I use LMF rust solution then boil the piece to get a rust blue finish,