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HUBCAPS
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M3A4, M4A1, M5A1, M6A1 & RL-35 CABLE REEL CART
M1 WHEELED MACHINE GUN MOUNT
RL-16 WIRE REEL & MODEL 1942 MARINE CART
81mm MORTAR
M3, M4, M5, M6, & M1A1 CHEMICAL MORTAR CART
A164570
1943 R.I.A.
M6A1 81mm Mortar Cart
A164570-3
A164570-3
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No Part number
So far all Hubcaps Ive noted are painted inside. Should have a paper Gasket.
These caps were mixed and matched on various Carts so there is no way to tell
Manufaturer as of yet.

2.24 center hole to center hole.
2.49 O.D of rim
M1 Wheeled Machine Gun Mount.
No paint inside of Hubcap on examples I have seen.
This model of Hubcap used on other various prototype
Carts of the era.

2.65 I.D. of Cap
RL-16 Cable Reel Cart. & Model 1942 Marine Corps Cart.
These Hubcaps are identical and will fit on either hub.
No paint inside of Hubcap on various examples I have seen.
This model of Hubcap used on other various prototype Carts during the 1930,s.

2.24 I.D. of Cap
M3 Aluminum series & M1A1 Chemical Mortar Cart
No paint inside of Hubcap on various examples I have seen.

2.39 I.D. of Cap
81mm Aluminum Mortar Cart. With 19" rims