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

Pair (2) 2-7/8" Oil Bath Hub Caps – Trailer Axle (21-35) (K71-038-00)
Pair (2) 2-7/8" Oil Bath Hub Caps – Trailer Axle (21-35) (K71-038-00)
$26.27
ST-400D-LOTOF4
FOUR 4" Valcrum Aluminum Hub Cap 10K 12K 15K Trailer Axle Grease/Oil 21-36 Dexter (ST-400-LOTOF4)
$247.95
O Ring ONLY for Oil Cap, ALKO 3.75 Cap 10k-16k (010-258-00)
O Ring ONLY for Oil Cap, ALKO 3.75 Cap 10k-16k (010-258-00)
$4.99
Dexter FORTRESS 4" Diameter Aluminum 21-36 Oil Cap for 10-15,000 lb axles (K21-301-00)
Dexter FORTRESS 4" Diameter Aluminum 21-36 Oil Cap for 10-15,000 lb axles (K21-301-00)
$55.63
4 - Dexter FORTRESS 4" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-305-00-FOUR)
4 - Dexter FORTRESS 4" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-305-00-FOUR)
$189.03
4 - O-RING, 2.359 I.D. X .139 FOR 021-040-00 OIL CAP ONLY (010-059-00-LOTOF4)
4 - O-RING, 2.359 I.D. X .139 FOR 021-040-00 OIL CAP ONLY (010-059-00-LOTOF4)
$11.14
2 - Dexter FORTRESS 4" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-305-00-PAIR)
2 - Dexter FORTRESS 4" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-305-00-PAIR)
$96.74
Dexter FORTRESS 4" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-305-00)
Dexter FORTRESS 4" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-305-00)
$57.25
O-RING, 3.734 I.D. X .139 FOR Dexter Oil Caps 021-036-00 & 021-037-00 21-36 21-37 (010-050-00)
O-RING, 3.734 I.D. X .139 FOR Dexter Oil Caps 021-036-00 & 021-037-00 21-36 21-37 (010-050-00)
$4.99
2 - Dexter FORTRESS 3.75" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-304-00-PAIR)
2 - Dexter FORTRESS 3.75" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-304-00-PAIR)
$84.99
4 - O-RING, 3.734 I.D. X .139 FOR DEXTER Oil Caps 021-036-00 & 021-037-00 21-36 21-37 (010-050-00-LOTOF4)
4 - O-RING, 3.734 I.D. X .139 FOR DEXTER Oil Caps 021-036-00 & 021-037-00 21-36 21-37 (010-050-00-LOTOF4)
$5.99
4 - Dexter FORTRESS 3.75" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-304-00-FOUR)
4 - Dexter FORTRESS 3.75" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-304-00-FOUR)
$168.00