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

K71-747-00
2x Dexter 21-40 2-5/8" Oil Cap for 6K UTG Demountable Utility Trailer axle Hubs (K71-747-00)
$37.84
Oil Cap Billet Aluminum 4"-12 10KHD-15K Chrome Plated 2PC Hub/Drum (21-36 Billet Aluminum)
Oil Cap Billet Aluminum 4"-12 10KHD-15K Chrome Plated 2PC Hub/Drum (21-36 Billet Aluminum)
$38.88
4 - Dexter FORTRESS 2.875" Diameter Aluminum 21-35 Oil Cap for 5,200-8,000 lb axles (K21-303-00-FOUR)
4 - Dexter FORTRESS 2.875" Diameter Aluminum 21-35 Oil Cap for 5,200-8,000 lb axles (K21-303-00-FOUR)
$168.00
2 - Dexter FORTRESS 2.875" Diameter Aluminum 21-35 Oil Cap for 5,200-8,000 lb axles (K21-303-00-PAIR)
2 - Dexter FORTRESS 2.875" Diameter Aluminum 21-35 Oil Cap for 5,200-8,000 lb axles (K21-303-00-PAIR)
$84.00
Oil Cap, 4"-12, AM, Fits Dexter, 10K HD, 12K, 15K, Pre-09 10K GD, (OC-86510-16)
Oil Cap, 4"-12, AM, Fits Dexter, 10K HD, 12K, 15K, Pre-09 10K GD, (OC-86510-16)
$8.99
K71-148-00
(2) Oil Cap Dexter 10K-HD 12K& 15K 4.0" threads Trailer Axle Plastic Cover 21-36 (K71-148-00)
$37.99 $42.50 Sale
2 - Dexter FORTRESS 4" Diameter Aluminum 21-36 Oil Cap for 10-15,000 lb axles (K21-301-00-PAIR)
2 - Dexter FORTRESS 4" Diameter Aluminum 21-36 Oil Cap for 10-15,000 lb axles (K21-301-00-PAIR)
$95.13
Dexter FORTRESS 2.875" Diameter Aluminum 21-35 Oil Cap for 5,200-8,000 lb axles (K21-303-00)
Dexter FORTRESS 2.875" Diameter Aluminum 21-35 Oil Cap for 5,200-8,000 lb axles (K21-303-00)
$42.00
4 - Dexter FORTRESS 4" Diameter Aluminum 21-36 Oil Cap for 10-15,000 lb axles (K21-301-00-FOUR)
4 - Dexter FORTRESS 4" Diameter Aluminum 21-36 Oil Cap for 10-15,000 lb axles (K21-301-00-FOUR)
$187.04
2 BILLET ALUMINUM 4" Oil Bath Cap 21-36 Trailer Axle Bearing Hub 10K-HD 12K-15K (21-36 Billet-Kitx2)
2 BILLET ALUMINUM 4" Oil Bath Cap 21-36 Trailer Axle Bearing Hub 10K-HD 12K-15K (21-36 Billet-Kitx2)
$118.77
Dexter FORTRESS 3.75" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-304-00)
Dexter FORTRESS 3.75" Diameter Aluminum Oil Cap for 10,000-16,000 lb axles (K21-304-00)
$48.28
4.0" BILLET ALUMINUM Oil Bath Cap 21-36 Trailer Axle bearing hub 10K-HD 12K-15K (21-36 Billet-KIT)
4.0" BILLET ALUMINUM Oil Bath Cap 21-36 Trailer Axle bearing hub 10K-HD 12K-15K (21-36 Billet-KIT)
$72.96