Power Rectifier diodes needed

[Electronic M]

Radio shack should have suitable replacements...Not of those numbers though.
You want to find the data sheet for the original or compatible types to find the peak reverse voltage rating as when selecting a replacement that is an important speck.
Look for one with the same or higher forward higher current and peak inverse(reverse) voltage specks as a replacements.

BTW if the originals are selenium and not silicon like I'm assuming then you also should need a series dropping resistor to compensate for the lower forward voltage drop.

[bob91343]

Use 1N4007. They cost only a few cents each and I recommend buying 100 or so, as they come in handy many a time. Rated 1.0 A and 1000 V.