IPD (www.ipdusa.com) has all that ignition stuff listed in their catalog doing a vehicle lookup for your 1800, both OE Bosch and aftermarket. Take careful note of the fitment issues in the ipd listings. From there you can get the Volvo and Bosch p/n's in case you want to try sourcing some or all of those items from some place cheaper. Skandix (www.skandix.de/EN) is another great place to do a vehicle lookup to get the Volvo p/n's of rare stuff.

I don't recommend using Bosch p/ns for difficult to source old stuff as Bosch uses a number of different p/n's for their reference and is forever revising their p/n's with something newer (superceded part) that's either identical, nearly identical or at least compatible. Parts house catalogs may not get revised with the latest p/n's or even have a mix of new and old Bosch p/n's in stock that will work. Volvo also has superceded part numbers that can be helpful when looking for a single part on places like eBay.

Do a Google search using the Volvo part number and including the words 'Volvo' and 'Bosch". The same or similar distributor was used on a number of Volvo engines, including Volvo marine engines. After you've done a few searches for the various Volvo p/n's you'll soon start discoverying the parts houses that carry these items and have them in stock. Be careful of the shipping charges which may not be calculated until you do a checkout. Mant checkouts do not have a backup option, so to get out of a checkout you don't wish to complete then use your browser backup function to get back and edit your cart (may take multiple backup steps) or simply close your browser tab to get out (the shopping cart will often still be there in your browser cookies until the cookie eventually expires).
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now