I'm surprised that your Konis won't fit! My memory was that the original shocks for the TC were similar to the S2 and they had a larger diameter spring than what you would fit on Konis, Spax, AVO, etc... In what way don't they fit?
The PO is right that Konis are rebuildable. I believe I had a set of them rebuilt many years ago but I eventually went to Spax and I have no complaints other than the steel housing allows the threaded part to get rusty. You might give Dave Bean or r.d. enterprises a call to see what they have. Failing that, Richard will always have the right stuff. I have some springs of different lengths and rates. If you're interested, PM me.