Welcome to the forum!
Any N frame FP bushing will be the same pre 1999 when the floating/frame mounted firing pin was introduced.
Call S&W and ask for the "hammer nose bushing". Hammer nose is what S&W calls the firing pin. Ask for one for a Model 25 with the hammer nose (firing pin) mounted on the hammer, pre model 25-11 (1999 or older.)
Have you checked with any local shops if you have local shops? Post an adv on this forum under the classified section?
My sources to check:
S&W CS/Parts Dept
By Telephone:
1-800-331-0852 (USA)
Mon-Fri 8:00AM-8:00PM Eastern Time
Live Chat here:
Contact Us - Smith & Wesson
Good sources you probably use already are E-bay and Gunbroker. Set up a search for "smith wesson parts".
"Aonepawninc"
http://stores.ebay.com/aonepawninc
has a bunch of S&W parts for sale. I just ordered a complete hammer for my pre model 30 from them. They are very customer oriented and have very reasonable prices. 1/10/16
Dave Bennett: Parts and guns from 1900 up to 1970's.
e-Mail:
[email protected]
Web Site:
www.22ammobox.com
David Clements - Clements Custom Guns
PH: 276-238-8761
2766 Mt. Zion Rd.
Woodlawn, VA 24381
[email protected]
Clements Custom Guns
Charlie Duffy: Parts for Pre-WWII S&W's.
Phone: 845-679-8136
e-Mail:
[email protected]
Jim Horvath: Many parts for all S&W's (large and small) from 1860 up;
can reproduce parts.
e-Mail:
[email protected]
Jeff Lee: Lee's Gun Parts (an extensive supply of gun parts, including S&W)
(Open to the public on Tuesdays, Wednesdays and Thursdays).
3401 W. Pioneer, Suite 2, Irving, TX 75061
Phone: 972-790-0773
Parallels H-Sphere
Jan Matlega: Parts for Pre-WWII S&W hand-ejectors.
Mail Address: 528 Eddy Glover
New Britain, CT 06053
Phone: 860-229-6872
Poppert's Gun Parts:
http://www.poppertsgunparts.com/
P.O. Box 413
Glenside, PA 19038
Tel: 215-887-2391 Fax: 215-887-5816
Email:
[email protected]
Charlie Pate: Provides screws (original & reproduction) for S&W Tip-ups and Top-breaks; author of books and articles on S&W guns.
Phone: 703-533-8057
e-Mail:
[email protected]
Phil Saccacio: Phone: 540-456-6405
e-Mail:
[email protected]
Dave Szilagy: Manufacture's parts for older S&W's.
Mail Address: 3107 Electric, Lincoln Park, MI 48146
e-Mail:
[email protected]
Mike Veilleux: Guns and Gun Parts
All Parts inc. for Pre- and Post-WWII S&W's.
Phone: 413-732-9938
e-Mail:
[email protected]
Web Site:
www.gunsnparts.com
Liberty Tree Collectors Phone:207-285-3111
139 Main Street, Corinth, ME 04427
Email:
[email protected]
Liberty tree collectors has original, CCH lanyard rings (but without the retaining pin) for $25.
S&W Parts; antique and new
[email protected]
Ph: 352 394-7412