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

X1 Oil Cap, billet Aluminum, for 21-36 fits drums 9-44 9-27 9-28 12 threads 4" WITH WRENCH (21-36-BILLET-WRENCH-KIT)
X1 Oil Cap, billet Aluminum, for 21-36 fits drums 9-44 9-27 9-28 12 threads 4" WITH WRENCH (21-36-BILLET-WRENCH-KIT)
$88.38
X2 Oil Cap, billet Aluminum, for 21-36 fits drums 9-44 9-27 9-28 12 threads 4" WITH WRENCH (21-36-BILLET-WRENCH-KITX2)
X2 Oil Cap, billet Aluminum, for 21-36 fits drums 9-44 9-27 9-28 12 threads 4" WITH WRENCH (21-36-BILLET-WRENCH-KITX2)
$133.37
ONE - Oil Cap Fits 6-8K Axles 2-7/8"-12 threads Includes O Ring and Plug (21-35-KIT)
ONE - Oil Cap Fits 6-8K Axles 2-7/8"-12 threads Includes O Ring and Plug (21-35-KIT)
$8.99
21-35 Billet-KIT
2-7/8" BILLET ALUMINUM Oil Cap Fit Dexter 21-35 Trailer Axle Bearing Hub 6K-8K (21-35 Billet-KIT)
$36.95
X1 Oil Cap, 2.875"-12, Billet Aluminum, Fits Lippert & Dexter, 6K-8K, WITH WRENCH (21-35-BILLET-WRENCH-KIT)
X1 Oil Cap, 2.875"-12, Billet Aluminum, Fits Lippert & Dexter, 6K-8K, WITH WRENCH (21-35-BILLET-WRENCH-KIT)
$43.95
Tightening Wrench for 2-7/8" Oil Plastic Aluminum Caps Fits 21-35 Cap 7k (Billet-Wrench-2.25)
Tightening Wrench for 2-7/8" Oil Plastic Aluminum Caps Fits 21-35 Cap 7k (Billet-Wrench-2.25)
$24.86
3-3/4" Oil Cap w/ ORing & Plug 10K-16000# Hayes Alko Trailer Axle Bearing Dust 21-219 (K71-859-00)
3-3/4" Oil Cap w/ ORing & Plug 10K-16000# Hayes Alko Trailer Axle Bearing Dust 21-219 (K71-859-00)
$39.99
4 Pack Replacement 8K 2-7/8" Oil Bath Caps Trailer Axle Fits Dexter 21-35 LCI 8000# (OC-86580-26-LOTOF4)
4 Pack Replacement 8K 2-7/8" Oil Bath Caps Trailer Axle Fits Dexter 21-35 LCI 8000# (OC-86580-26-LOTOF4)
$27.21
Billet Aluminum Machined 2-7/8" Oil Bath Cap (21-35 Billet-Chrome-Kit)
Billet Aluminum Machined 2-7/8" Oil Bath Cap (21-35 Billet-Chrome-Kit)
$51.99
X4 Oil Cap, billet Aluminum, for 21-36 fits drums 9-44 9-27 9-28 12 threads 4" WITH WRENCH (21-36-BILLET-WRENCH-KITX4)
X4 Oil Cap, billet Aluminum, for 21-36 fits drums 9-44 9-27 9-28 12 threads 4" WITH WRENCH (21-36-BILLET-WRENCH-KITX4)
$223.39
ONE (1) 21-36 Oil Cap Dexter 10K-HD 12K & 15K 4.0 threads Trailer Axle Plastic Cover (21-36-KIT)
ONE (1) 21-36 Oil Cap Dexter 10K-HD 12K & 15K 4.0 threads Trailer Axle Plastic Cover (21-36-KIT)
$16.46
PAIR - 2-7/8" BILLET ALUMINUM Oil Cap Fit Dexter 21-35 Trailer Axle Bearing Hub 6K-8K (21-35 Billet-KITX2)
PAIR - 2-7/8" BILLET ALUMINUM Oil Cap Fit Dexter 21-35 Trailer Axle Bearing Hub 6K-8K (21-35 Billet-KITX2)
$99.13