District DK150i

This is my first post on here. Sorry if this has been asked before, did a quick search but found nothing.
I have a MGP VX6 Team edition, and brought a District Dk150i deck, asked the shop first and was told the forks and everything would definitely fit. Surprise surprise, they were wrong. the forks fit in the hole, but the shim is way to long, so had to cut it down. Now the top bolt has threaded and no one seems to sell a replacement, so thinking the best action is to get new forks that actually fit the District deck. But on speaking to the shop, keep getting "they SHOULD fit", not really happy with this, would like a WILL fit.

so can anyone help me with what does fit this deck, and also what shim and compression i need as my current one is now broke?
 
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