I know of a few:
1) Numrich Gun Parts Online. I don't see the 088 listed specifically, but a host of other number variations (188, 158, 157, etc.)appear, mostly the newer, transfer-bar style. Their printed catalog features a diagram, also the t-bar type:
http://www.e-gunparts.com/model.asp?idDept=1012) NRA's American Rifleman, December 1988 edition (with reassembly tips).
3) The Gun Digest Book Of Exploded Long Gun Drawings: Contains illustrations of both styles of actions, newer transfer-bar type and older without t-bar system.
Numrich is a good source for various and sundry parts as well. :wink: