John-David, it may make a difference what serial number is on your friend's 1210. According to Parts Lookup (see link above), there were two versions of the 1210, and early one before S/N 756,300 and one from 756,300 to 799,999. Parts Lookup gives the same P/N for the replacement: 717-3044, so I'm not sure what difference there is between the two.
I would check out the offerings from your local tractor supply store. I know I've seen some clutches in there that I thought would work on my 782. In fact, the write-up on the 782 (1711, 1712, 784) PTO clutch on Parts Lookup reveals some particulars about how one new part can replace two old parts.
Finally, Charlie can source some of the individual parts which are no longer available from the dealer, like the bushing.
Anyway, here are some images and text relaying what I found in my searches.
Early 1210 PTO Clutch Assy
Late 1210 PTO Clutch Assy
Compare 782 PTO Clutch Assy
(Early, S/N 756-299 and earlier, together with 1282 and 680)
Tag Part # Description
-- ---- 717-3044 ------ CLUTCH ASM
-- ---- IH-181668 Bolt, 7/16-NF X 1-1/4 Type 5
-- ---- IH-180143 Bolt, 7/16 X 3/4 Type 5
-- ---- 736-0171 Washer, Lock, 7/16
-- ---- 711-3006 Stud, 7/16-14
01 ---- IH-223413-C1 Field Assembly
02 ---- IH-223408-C1 Rotor
03 ---- 759-3304 Armature
04 ---- 759-3305 Drum
05 ---- 759-3306 Kit, Spring
-- ---- IH-9413243 Nut, 3/8-NF Cad P/T Lock Type 5
06 ---- IH-27625-R1 Key, 1/4 X 5/8 Sq Parallel
07 ---- 736-3017 Washer
(Late, S/N 756-300 to 799,999)
Tag Part # Description
717-3044 PTO Clutch (Includes Ref No. 1, 2, 3, 4 & 5)
01 ---- 759-3300 Field
02 ---- 759-3301 Rotor
03 ---- 759-3304 Armature
04 ---- 759-3305 Drum, Brake
05 ---- 759-3306 Spring & Nut Kit
06 ---- 710-3030 Screw, Hex Cap, 7/16-14 X .75 Lg GR5
07 ---- 736-0171 Washer, Lock, 7/16
08 ---- 736-3086 Washer, Ext. Lock, .45 X .75 X .035 Thk
09 ---- 726-3008 Clamp, Cable
10 ---- 736-3017 Washer, Flat, .47 X 1.5 X .225 Thk
11 ---- 710-3029 Screw, Hex Cap, 7/16-20 X 1.25 Lg GR5
12 ---- 714-0119 Square key, 1/4 x .75lg
Cf. 1711, 1712, 782, 784
Tag Part # Description Qty
-- ---- 717-3044 CLUTCH ASM
-- ---- IH-181668 Bolt, 7/16-NF X 1-1/4 Type 5
-- ---- IH-180143 Bolt, 7/16 X 3/4 Type 5
-- ---- 736-0171 Washer, Lock, 7/16
-- ---- 711-3006 Stud, 7/16-14
01 ---- IH-223413-C1 Field Assembly | (Used in Clutch Assembly IH-144720-C91)
-- ---- 759-3300 Field Assembly | (Used in Clutch Assembly 717-3044)
02 ---- IH-223408-C1 Rotor | (Used in Clutch Assembly IH-144720-C91)
-- ---- 759-3301 Rotor | (Used in Clutch Assembly 717-3044)
03 ---- 759-3304 Armature | (Used in Clutch Assembly 717-3044)
-- ---- IH-223407 Armature | (Used in Clutch Assembly IH-144720-C91)
04 ---- 759-3305 Drum
05 ---- 759-3306 Kit, Spring
-- ---- IH-9413243 Nut, 3/8-NF Cad P/T Lock Type 5
06 ---- IH-27625-R1 Key, 1/4 X 5/8 Sq Parallel
07 ---- 736-3017 Washer