Bolts for trunk lids

[Kendo]

I thought I could figure out the bolt nomenclature for the trunk and engine lid bumper bolts. 13C in front and 14A in the back. But the manual lists two possible meanings of a two digit number, diameter and length. And the A and C can have a few meanings. So can you help with what 13C and 14A mean? I vaguely recall they are 3/8-24 threads. But that could be 5 year old memories leaking.

Page 5, items 18: https://www.lotuseuropa.org/images/WorkshopManual/PartManual/tcb.pdf

My paint guy suddenly wants the mounting hardware to check panel fit, so I'm trying to source the bolts.

[Kendo]

Those 13C and 14A "part numbers" don't make any sense in the Lotus bolt specification system. But I just noticed the first line of the #18 item in the parts book is X046B6113Z. So trying to break that down,

X - Hexagon head
04 - # of 1/16" increments in diameter == 1/4"
6 - no idea
B - Bolt
61 - Length in 16ths. inch = 3.8125 = 3-13/16"
13 - no idea
Z - lots of parts end in Z for no given reason

Does that look more or less right? I don't have the car with me right now, but I think a 1/4" bolt fits the hole.

[Clifton]

I don't remember the bolt size  through the body to hinge but the hinge to hatch lid on mine are 1/4" fine. I used studs w/loctite and I used thin nyloc nuts.

[4129R]

Search on eBay for "Classic Car Bumper Bolts".

[Kendo]

Just to wrap this up, what ended up fitting was:

Front: 5/16-24 x 1-1/4"
Rear: 5/16-24 x 1-1/2"