Graeme - There's a General Service Manual for games around this era with a breakdown of all the parts. As an example - This is the General Service Manual for Bally machines for 1987;

http://cgi.ebay.com/Bally-Service-Bulletin-Book-1987-ORIGINAL_W0QQitemZ360153005508QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item53dacabdc4&_trksid=p4634.c0.m14.l1262&_trkparms=|301%3A1|293%3A1|294%3A30

It covers the games released and has a breakdown of parts for those machines.

You need the manual that covers your era. I have older Service Manuals - But the parts may be different.

Coil Sleeves are fairly generic - just measure yours - they will probably be 1 3/4 or 2 1/16

Springs MAY be the same - PM me and I'll check my manuals.