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Your search for "21-88 oil cap" revealed the following:

Pair Oil plug Center plug for hole in center of oil cap Replaces Dexter 046-032-00 Plug Fits 21-35 21-36 21-88 Caps(OC-Rubber Plug-LOTOF2)
Pair Oil plug Center plug for hole in center of oil cap Replaces Dexter 046-032-00 Plug Fits 21-35 21-36 21-88 Caps(OC-Rubber Plug-LOTOF2)
$2.99
Oil plug Center plug for hole in center of oil cap Replaces Dexter 046-032-00 Plug Fits 21-35 21-36 21-88 Caps(OC-Rubber Plug)
Oil plug Center plug for hole in center of oil cap Replaces Dexter 046-032-00 Plug Fits 21-35 21-36 21-88 Caps(OC-Rubber Plug)
$1.51
OC-86510-16-LOTOF4
(4) Replacement Oil Caps 10KHD 12K&15K 4" threads Trailer Axle 21-36 Fits Dexter (OC-86510-16-LOTOF4)
$39.21
ONE 3.5" Valcrum Aluminum Hub Cap Fits 9K-10K GD Trailer Axle Oil 21-88 Dexter (ST-350)
ONE 3.5" Valcrum Aluminum Hub Cap Fits 9K-10K GD Trailer Axle Oil 21-88 Dexter (ST-350)
$52.25
X4 Oil plug Center plug for hole in center of oil cap Replaces Dexter 046-032-00 Plug Fits 21-35 21-36 21-88 Caps(OC-Rubber Plug-LOTOF4)
X4 Oil plug Center plug for hole in center of oil cap Replaces Dexter 046-032-00 Plug Fits 21-35 21-36 21-88 Caps(OC-Rubber Plug-LOTOF4)
$4.90
4 Pack Billet Aluminum Oil Bath Caps 2-7/8"-12 — Replaces Dexter 21-35 (21-35 Billet-Chrome-KitX4)
4 Pack Billet Aluminum Oil Bath Caps 2-7/8"-12 — Replaces Dexter 21-35 (21-35 Billet-Chrome-KitX4)
$193.84
OC-86510-16-LOTOF2
(2) Replacement Oil Caps 10KHD 12K&15K 4" threads Trailer Axle 21-36 Fits Dexter (OC-86510-16-LOTOF2)
$19.25
X4(FOUR) 3.5" Oil Bath Cap Trailer Axle Dexter 9K 10K 8-415 430 After 2009 (21-88-KIT-LOTOF4)
X4(FOUR) 3.5" Oil Bath Cap Trailer Axle Dexter 9K 10K 8-415 430 After 2009 (21-88-KIT-LOTOF4)
$56.89
2 Pack - Billet Aluminum Oil Bath Dust Caps — 2-7/8"-12 Thread Pair (21-35 BILLET-CHROME-KITX2)
2 Pack - Billet Aluminum Oil Bath Dust Caps — 2-7/8"-12 Thread Pair (21-35 BILLET-CHROME-KITX2)
$99.13 $126.99 Sale
10k GD Hub Drum kit with bearings seals and oil cap, fits Dexter (RP8-430-05-KIT)
10k GD Hub Drum kit with bearings seals and oil cap, fits Dexter (RP8-430-05-KIT)
$344.73
Fortress Aluminum Oil Cap, 9K - 12K, Bolt On, With O-Ring and Plug (K21-259-00)
Fortress Aluminum Oil Cap, 9K - 12K, Bolt On, With O-Ring and Plug (K21-259-00)
$34.49
OC-86580-26-LOTOF2
(2) Replacement 2-7/8" Oil Bath Caps Trailer Axle Fits Dexter 21-35 6K 7K 8K (OC-86580-26-LOTOF2)
$17.52