For the frizzen, you are probably better off ordering a replacement frizzen from Lyman if you have a TC Hawken or Renegade. The frizzens are hardened better and are generally better quality. I was able to find one easily in a local gun shop, but you should be able to order them online from Lyman or a muzzleloading parts site. As for the spring, that advice will have to come from somewhere else as I'm not sure if the Lyman springs are compatible.
Be careful with lyman frizzen springs,I purchased two from RMC, $20 a piece,the first one broke on installation and the second one broke the first time I opened the frizzen
after the installation. RMC would not do anything for me ,the implication from them was that I did not know how to install the spring. Those springs at that time were improperly tempered,had i known that before I tried the installation I would have properly tempered them myself ,so I was out $40 and still needed frizzen springs.
Then from the help of a friend we made our own,I cannot explain the process of doing that here,but now I have springs that work and the know how to make more.
I would suggest you take the lock to a shop and have them install the spring,I know it's a simple task,but if they break it they own it, if it breaks when you do it (oh well),your on your own.