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

O-RING, 2.359 I.D. X .139 FOR 021-040-00 OIL CAP ONLY (010-059-00)
O-RING, 2.359 I.D. X .139 FOR 021-040-00 OIL CAP ONLY (010-059-00)
$4.99
OIL CAP 8K ALKO THREADED CLEAR 2 7/8 -8 UNA-2A kit (K71-845-00)
OIL CAP 8K ALKO THREADED CLEAR 2 7/8 -8 UNA-2A kit (K71-845-00)
$38.42
Threaded Aluminum Oil Cap Kit for ALKO and Hayes 7K - 8K Axles, 2-7/8" (D021-212-10)
Threaded Aluminum Oil Cap Kit for ALKO and Hayes 7K - 8K Axles, 2-7/8" (D021-212-10)
$44.99
Oil Cap, 2.875", Aluminum, Valcrum, Fits Dexter, Lippert, Kodiak, 21-35 / 038, 21-29, 695814, 8001, 8K axles (ST-2875)
Oil Cap, 2.875", Aluminum, Valcrum, Fits Dexter, Lippert, Kodiak, 21-35 / 038, 21-29, 695814, 8001, 8K axles (ST-2875)
$47.50
1.98 UFP Kit w/Caps O-rings Tube of Grease 1.68" x 2.56" Seals Bearings Races (BK2-256-GREASE)
1.98 UFP Kit w/Caps O-rings Tube of Grease 1.68" x 2.56" Seals Bearings Races (BK2-256-GREASE)
$162.66
RW12011-1
Rockwell 3.75" Oil Cap Assembly for 9K–16K Drums (RW12011-1)
$26.28
Axle Bearing Kit 10-56 Seal Trailer Axel ONE Oil Cap Dexter 12K & 15K 4.0 threads Trailer Axle Plastic Cover (BK-12000-21-36-KIT)
Axle Bearing Kit 10-56 Seal Trailer Axel ONE Oil Cap Dexter 12K & 15K 4.0 threads Trailer Axle Plastic Cover (BK-12000-21-36-KIT)
$64.95
O-RING, 2.609 I.D. X .139 For Oil Caps 021-035-00 & 021-022-00 (010-045-00)
O-RING, 2.609 I.D. X .139 For Oil Caps 021-035-00 & 021-022-00 (010-045-00)
$4.99
Rockwell 3.75" Oil Cap Assembly (Pair) – Fits 9K–16K Drums (RW12011-2)
Rockwell 3.75" Oil Cap Assembly (Pair) – Fits 9K–16K Drums (RW12011-2)
$46.51
BK-7000-O-CAP
Trailer Bearing / Oil Seal Kit 8 Lug Axle 14125A/25580 6K 7K with Oil Cap 21-35 (BK-7000-O-CAP)
$83.17
ST-400-LOTOF4
FOUR 4" Dexter Aluminum Hub Cap Dexter 10K-16K Trailer Axle Grease/Oil 21-36 (ST-400D-LOTOF4)
$239.99
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