The Electronics Universe

Hello, I am a newbie and student of electronics here in Minnesota. I am also looking forward to get my Ham Radio License in a near future. I found this site while looking for information to repair a IC745 that an instructor gave me. This 745 is in need of all the repairs/mods found in the excellent YouTube videos. I managed to get the RAM board but have a hard time finding a supplier for the 6 and 12 pf ceramic trimmers and the 24 pf NPO capacitor. When I will open the 745 I will look for the values of the electronic capacitors recommended in the video to replace in PLL. These caps should not be a problem. I am now saving a bit to buy a frequency counter and some other expenses......student live!!!
Would you kindly help me identify a site where I can order the ceramic trimmers and the 24 pf NPO capacitors  OR similar?
I will appreciate your input.
Thanks,
Luis.