You probably thought of this already but would hood pins work well? Seems like it might reduce costs even more.
Thats what the competition is selling for $40 shipped. I am not sold that those hold tight. I prefer to copy the OMF engineering quality. I thought I would match the $40 shipped price for the 86-87 model, but these will hold down tight. The ATC and 88-89 studs are longer and more heavy duty and cost a $1 each more
85-86 ATC that use the tall rubber cushion $42 shipped (Cushions for display only- not included in purchase)

88-89 TRX that use the tall cushion also $42 shipped (Cushions for display only- not included in purchase)

86-87 that use a short cushion $40 shipped (these are what they were all going to be price wise with the short studs) (Cushions for display only- not included in purchase)

86-87 that use tall cushions $42 shipped -for those who have bought tall cushion replacements (Cushions for display only- not included in purchase)

Replacement Carr-Lane knob with clear coat $7

Replacement Carr-Lane knobs set with clear coat $14

These knobs can be purchased from Carr-Lane Current price are $4.70 each see link below
http://www.carrlane.com/catalog/index.cfm/index.cfm?FuseAction=PartCheck&pn=CL-20-HK-4A&Product_ID=114This post should give Trevor enough info to put them one the website.