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https://www.shapeways.com/product/SWTBXTJER/ultima-mid-rerelease-conversion-kit-v2?optionId=153718417&li=shops
This is from Mr. Ed's, he's a member here.

I recieved the new deck from Factory Works today . Looks like it will fit like a glove !

Just off the shelf,
Time to clean and tune the old girl.
All the "cool" mods from back in the day . DuraTrax head, pipe and ball diff. Thorp disc brake. Ported the case and sleeve in the CZ-R. Robinson Racing Front caster kit.

Very nice !
Gathering parts to rebuild my original Optima ... Has an original Option house belt conversion . Going to update to the "new" transmission, just for the slipper and 48 pitch gears. ANd picked u p an original one-way for the front . Will post soon .

Here she is as a roller .....

Ive been using Xtra Speed CV shafts in all my new , and resto work. Check RC Mart.
Nice quality pieces at a reasonable price. The rere's will fit too

https://www.rcmart.com/xtra-speed-spring-steel-universal-drive-shaft-set-for-kyosho-1-10-ultima-optima-2016-javelin-xs-om27011-00100843
They sell for about $19
I use them in my new and old Ultimas, My Rampage GP10 , and my Optima.