Fuel filler neck modification

Hello,

I got -92 cabriolet and i need new filler neck. What are those modifications for this neck so i can fit it to my cabrio?


http://www.vwheritage.com/vw_spares_Fuel-filler-neck-Mk1-Golf-Jetta-171201129F_act_shop.product_pID_16378801.htm?crumbStartPage=1


And which one is correct seal to -92, 2H, digifant 2. K-jet or carburettor ?http://www.vwheritage.com/vw_spares_Seal-Fuel-Filler-Neck-K-Jetronic-models-Mk1-Golf-Scirocco-171201119E_act_shop.product_pID_154230295.htm

http://www.vwheritage.com/vw_spares_Fuel-filler-neck-seal-neck-to-body-Mk1-Golf-Jetta-carb-mo-171201119F_act_shop.product_pID_153581636.htm?crumbStartPage=1&crumbStartRow=1

Get all your parts including neck from funk-star on his classic-vw site.

Necks are sold out in classic. And heritages got 71(EUR-) postage to Finland. Maybe i try ebay, but if someone can tell me what are those modifications to tintop neck.