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

PAIR — 4" Lippert Oil Cap Replacement Kits Fits 10K–16K Axles (183772-KITX2)
PAIR — 4" Lippert Oil Cap Replacement Kits Fits 10K–16K Axles (183772-KITX2)
$58.42
Oil Cap O-Ring, Vault / UFP, 1.98" fits 05800U Cap (32742U)
$5.57
ST-400D
ONE 4" Valcrum Aluminum Hub Cap 10K 12K 15K Trailer Axle Grease/Oil 21-36 Dexter (ST-400)
$79.99
Bearing Replacement Kit for Dexter 10K GD Trailer Axle w/21-36 Oil Cap 9-44 Drum (BK4-287-GD+21-36CAP)
Bearing Replacement Kit for Dexter 10K GD Trailer Axle w/21-36 Oil Cap 9-44 Drum (BK4-287-GD+21-36CAP)
$69.99
2 BILLET ALUMINUM Oil 3.5"Cap Fit Dexter 21-88 Trailer Axle Bearing Hub10K 9-123 (21-88 Billet-KITx2)
2 BILLET ALUMINUM Oil 3.5"Cap Fit Dexter 21-88 Trailer Axle Bearing Hub10K 9-123 (21-88 Billet-KITx2)
$122.89 — Sold Out
X4 Oil cap, 21-88, Solid Billet Aluminum 3.5" WITH WRENCH (21-88-BILLET-WRENCH-KITX4)
X4 Oil cap, 21-88, Solid Billet Aluminum 3.5" WITH WRENCH (21-88-BILLET-WRENCH-KITX4)
$208.10 — Sold Out
X1 Oil cap, 21-88, Solid Billet Aluminum 3.5" WITH WRENCH (21-88-BILLET-WRENCH-KIT)
X1 Oil cap, 21-88, Solid Billet Aluminum 3.5" WITH WRENCH (21-88-BILLET-WRENCH-KIT)
$88.39 — Sold Out
21-88 Billet-KIT
3.5" BILLET ALUMINUM Oil Cap Fit Dexter 21-88 Trailer Axle bearing hub 10K 9-123 (21-88 Billet-KIT)
$50.66 — Sold Out
X2 Oil Cap, 2.875"-12, Billet Aluminum, Fits Lippert & Dexter, 6K-8K, WITH WRENCH (21-35-BILLET-WRENCH-KITX2)
X2 Oil Cap, 2.875"-12, Billet Aluminum, Fits Lippert & Dexter, 6K-8K, WITH WRENCH (21-35-BILLET-WRENCH-KITX2)
$112.99 — Sold Out
X4 Oil Cap, 2.875"-12, Billet Aluminum, Fits Lippert & Dexter, 6K-8K, WITH WRENCH (21-35-BILLET-WRENCH-KITX4)
X4 Oil Cap, 2.875"-12, Billet Aluminum, Fits Lippert & Dexter, 6K-8K, WITH WRENCH (21-35-BILLET-WRENCH-KITX4)
$189.09 — Sold Out
(021-219-00) Oil Cap, ALKO 3.75" CAP ONLY 10K to 16K K568220, 3.67-8 threads
$10.00 — Sold Out
3.5" Quality Rockwell Oil Bath Cap for 9k-10k Trailer Axle -Years 1996 & Older (7108098-KIT)
3.5" Quality Rockwell Oil Bath Cap for 9k-10k Trailer Axle -Years 1996 & Older (7108098-KIT)
$15.99 — Sold Out