Hi Barry, My name is XXXXX XXXXX it is my pleasure to assist you. For the key click tis link www.clockworks.com then go to clock parts and hardware scroll down to key click it then scroll down to 5 Prong Key Set x 2 part number CK8 this way you will know that you have a key that will fit I don't know the arbor shaft size.

You can order your part from one of the companies I use to order parts from
they are all quite reliable.The phone works the best for ordering your parts.
Just give them the make and model of your clock

Clockparts.com
XXXXX
Culver City, CA 90230 USA
Toll free: 1-888-8CRAFTS
Hours: Monday to Friday, 8AM to 4PM PST

Timesavers.com
Box 12700
Scottsdale, AZ 85267 U.S.A.
1-800-552-1520 1-480-483-3711
Fax: 1-480-483-6116
Monday through Friday Hours: 8:00 am - 4:00 pm (MST)

Norkro.com
2209 NW Mill Pond Rd.
Portland Or 97229
order line: 1-800-566-7576
Phone/fax:(NNN) NNN-NNNN/p>

Klockit.com
N3211 County Road H
Lake Geneva, WI 53147 USA
Phone: 1-800-556-2548
Fax: 1-262-248-9899
Monday-Friday 9:00am-5:00pm (Closed on Tuesdays) Saturday 8:30am-4:00pm

Clockworks.com
PO Box 339 -XXXXXbr/>Huntington MA 01050
800-381-7458

Back In Time Clock Repair & Restoration
345 North 4th Street
Souderton,Pa.18964
Phone(NNN) NNN-NNNN

RONELL CLOCK COMPANY
P.O. Box 5510
Grants Pass, OR 97527

1(800)(NNN) NNN-NNNNbr/>(fax)(NNN) NNN-NNNNbr/>info@ronellclock.com

R & M Imports
P.O. Box 60
Harveysburg, OH 45032
USA
Phone(NNN) NNN-NNNN
Fax(NNN) NNN-NNNN

Mailing Address:

Bill's Clockworks
8 W. Columbia Street
Flora, IN 46929
USA

Toll-free phone number: 1-888-742-5625

Phone number:(NNN) NNN-NNNN

billsclockworks.com/repair/ships-bell.htm

If you need further assistance, please don't hesitate to ask.
PLEASE remember to click the ACCEPT button if you're satisfied
with my answer so I will be compensated by JustAnswer for helping you.
There is no additional fee charged for my services.