Giant Overdrive 2 stem help! -- Other options besides giant?

So I have a Giant TCR Advanced and as you may know, it has a steertube of 1 1/4 rather than the traditional 1 1/8. Since I am looking to replace the stem on my bike, I wanted to know if anyone has replaced their stem with something other than a giant. I know that Pro can sell one but does anyone else know of other options other than pro and giant?

Thanks for the help!

Ritchey used to make a stem in 1.25. Don’t know if they still do.

This is what you need, that adapter pictured:

https://www.google.com/shopping/product/3388315579752154411?q=giant+stem+adapter&client=safari&sa=X&hl=en-us&biw=375&bih=553&tbs=vw:l,ss:44&prds=epd:9209038438280421648,paur:ClkAsKraXyoMjhZJX9hGHAwKauk9PQBIt1lSVDTR3U8mB3-lj6X0vJ-rXIAsjIdJXczNT79gyVHtANS0SBymDEsV0lryi8IGk4XS3uKbJJvDvWmDdwCbjWqU9xIZAFPVH71Otv9NUSZs7fC1FbvXD1l1MPTz9A,cdl:1,prmr:1,cs:1&ved=0ahUKEwj1t-ushM3fAhWFTd8KHVVzBMUQgTYIjAU
.

Zipp make one as well, Zipp SL-OS. I just put one on my TCX. I have about 20 different Giant stems, if you are looking for something specific let me know.

Canyon has plenty of stems for 1 1/4". In the past their bikes came with Syntace stems and later it was Ritchey. A few years ago they switched to their own (Canyon Branded) stems though. Specialized also makes stems with an insert to adjust the angle, these are also 1 1/4" without the angle adjusting insert.