The first one is a pair of spring-tensioned key release hooks. They're cool in a 'hasn't been seen much' kind of way. The rest are more or less traditional bonnet straps with all the hardware for less than it would cost to make some, and a final set of metal ones from an old American saloon.
Let me know what you think.
http://cgi.ebay.com/SPRING-BONNET-HOOKS-COMPETITION-STAINLESS-ALSO-MINI-SHS_W0QQitemZ220283248668QQihZ012QQcategoryZ43122QQcmdZViewItemQQ_trksidZp1742.m153.l1262
http://cgi.ebay.com/Dark-Brown-Leather-Small-Bonnet-Straps-pr-New-mini_W0QQitemZ360091305202QQihZ023QQcategoryZ43122QQrdZ1QQssPageNameZWD2VQQcmdZViewItemQQ_trksidZp1638Q2em122
http://cgi.ebay.com/Pair-of-Leather-Bonnet-Straps_W0QQitemZ230292895384QQihZ013QQcategoryZ43117QQrdZ1QQssPageNameZWD2VQQcmdZViewItemQQ_trksidZp1638Q2em122
http://cgi.ebay.com/EB-487-N-OMP-Racing-Bonnet-Pin-Leather-Straps-BLACK_W0QQitemZ370086556373QQihZ024QQcategoryZ10406QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Or, also for about $20.00, my personal favorites:
http://cgi.ebay.com/RALLY-BONNET-STRAPS-PAIR-HEAVY-DUTY-TAN-NKSTR001X2_W0QQitemZ220280709089QQihZ012QQcategoryZ43122QQrdZ1QQssPageNameZWD1VQQcmdZViewItemQQ_trksidZp1638Q2em118Q2el1247
In the off-the-wall, TC-would-approve category, THESE would eliminate the under-hood arms from the CMC-style lid; I'd guess they would mount up just fine with minimal problems and you'd have your cake while eating it:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=280268220773&ssPageName=ADME:B:WNARL:MOTORS:1123
(I found a picture of how that last set appear in nature on a 1937 Ford; http://www.edavidprice.com/tri-statecruisers/images/37Ford3.jpg -- and they look like they're about door-handle sized.)