Awesome job Ron! Your dedication and all of your detail work on the Rickster is an inspiration to me as I work on my sled, who name is "The Mistress", as my wife refers to my Q code since it takes up my time and my money. Thank you!!
I'm not sure if you're asking for an NOS part when you refer to "New" or if the Dynacorn reproduction part is adequate.
https://www.npdlink.com/product/drain-trough-trunk-lid-lower-corner-lh/204306/203182?year=1971...
Hey Trevynd have you checked with Mike at Motorcity Mustang? He's big into restoring 429 Stangs. He might have some brackets. Or check with Don at OMS. It's just a suggestion. Maybe you already did. I'm just trying to help ya out. Engine looks awesome in the pics!!!
Just posting this link for info purposes only. This gentleman restores original sending units.
https://desertclassicparts.com/product/rebuilt-oem-1971-1972-1973-standard-fuel-sending-unit-no-core-required/
Here is the link to the older post that one of our members added the fold down option to his sled.
https://7173mustangs.com/threads/converting-from-regular-to-fold-down-rear-seats.7879/#comment-78670
Mike at motor city mustang has a pair of the 73 mount brackets on E-bay right now
https://www.ebay.com/itm/165220567912
And just for reference WCCC has some pics of the 73 motor mount...
Ron I 'm not sure if the 72 motor mounts would work in your 73. I believe the 73 mounts are different. Just throwing that out there. Then again I'm probably wrong I'm definitely not an expert by any means.