Some coil packs are interchangeable with ours. I have had reasonable luck with these. Look at the terminals for an idea of their condition; avoid packs with corroded terminals.
There are even some of the individual coil packs that work (3 separate coils), but I have no experience with these.
The modules are very hard to come by. There are a lot that look like ours, but the wire connector on the d/s is 'keyed' differently.