I also used the Bosch relays and have their data sheet which lists 24v
relays, 20amp, normally open and a 10 amp normally closed.  The data sheet
calls them High capacity mini relays

Unfortunately I do not have the part number but Robert Bosch have offices in
Canada and must have them in the US.  I bought my relays from a local auto
supply house.  The Bosch number in Canada is 905-5420-3681 and the man I
spoke to was Jaime Salinas.

Regards

Ian Crowe