rear shock oil

[Tony and Jeanne <whosgoofy@adelphia.net>]

hello All,
I am rtying to figure out what oil to into the rear shocks.
They are in real good shape no leaking and seem to work fine.
The manual talks about Armstrong shock oil #624. What does that relate 
to at the local auto supply shop?
Also my plan is to drain all the old oil and fill as required, anything 
else I should do??? All the rubers look good and I am not going to paint 
them, just clean them and re-install them.
TIA
Tony
58 TR3A
TS27093   (slooowly putting things back together)