Your frame is nothing mysterious, it's a CHT between 2001 and 2004.
It has the 3D XL dropouts which appeared in 2001.
During this period they only offered the CHT (Colorado Hard Tail).
It must have the tapered downtube (wider at the BB).
You can see the differences on my Serotta Ti-Max and CST.
Hi Darrenwakler, Onza grips in phosphorescent is available on our website here : https://classic-repro.com/product/onza-handle-ules-neon-yellow/?lang=en
I don't know what you have against people who buy on Ebay.
I buy most of my bikes and parts on Ebay, there are all prices, like here.
And my bikes I present them to you 😉