Can I change the tuning step in my Chevrolet/Delco radio?

[Meddvedd]

Model 16211095. US-standard step 0.2 MHz,
but I live in Russia and need step 0.1 or 0.05MHz where radio stations are on odd-tenth and eve-tenth megahertz intervals.

 

[Ferb]

I found this:

http://vettenet.org/radio.html

dunno if your radio has the same diodes

ferb!